Large Amethyst

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The house we purchased has several large rocks in the yard.?

Someone mentioned that one of them might be Amethyst. It is a large rock about 2ft x 3ft. Is there any way I can tell without breaking it. If it is, does it have any value? I have one that I think is called brain coral. Any info on this one? Thanks for your help..:)

Amethyst is purple or violet crystals, and has a hardness of 7 on the Moh's scale, meaning it will scratch glass with about the same effort as other quartz minerals (Hint: most sand is made up of quartz minerals). Being a form of quartz, few acids react with it, so if you put it in a cup of warm vinegar (that's weak acetic acid) it shouldn't have a steady stream of tiny bubbles like limestone or calcite would have. When you heat Amethyst it usually turns permanently yellow.

Amethyst used to be as valuable as emeralds, rubies, diamonds, and other precious gemstones, that is until discoveries of huge deposits of it in Brazil made the value drop a great deal, but it is still worth a fair amount to collectors if it is an unusual specimen.

Check out these deals on Large Amethyst-related items and save!

Large Nice Bright Gemmy Purple Amethyst Quartz Scepter
Large Nice Bright Gemmy Purple Amethyst Quartz Scepter
$11.99
LARGE AMETHYST CRYSTAL CLUSTER CATHEDRAL GEODE FROM URUGUAY
LARGE AMETHYST CRYSTAL CLUSTER CATHEDRAL GEODE FROM URUGUAY
$239.20
RARE collectors specimen Amethyst geode with large crystal citrine and garnet
RARE collectors specimen Amethyst geode with large crystal citrine and garnet
$520.00
LARGE AMETHYST CRYSTAL CLUSTER CATHEDRAL GEODE FROM URUGUAY
LARGE AMETHYST CRYSTAL CLUSTER CATHEDRAL GEODE FROM URUGUAY
$263.20
AMETHYST STALACTITE 9 INCH 48 LB BRAZILIAN SPECIMEN LARGE GEM CRYSTAL W BASE
AMETHYST STALACTITE 9 INCH 48 LB BRAZILIAN SPECIMEN LARGE GEM CRYSTAL W BASE
$799.00
AA Aesthetic Large Amethyst Flower Rio Grande do Sol Brazil 17832
AA Aesthetic Large Amethyst Flower Rio Grande do Sol Brazil 17832
$175.00
Killer Large Amethyst Plate Rio Grande do Sol Brazil 17835
Killer Large Amethyst Plate Rio Grande do Sol Brazil 17835
$275.00
Large Amethyst Geode cut polished with display stand 4 1 2 across 2 1 4thick
Large Amethyst Geode cut polished with display stand 4 1 2 across 2 1 4thick
$9.95
9+ Pound Large Amethyst Crystal Cluster Display Specimen agate geode cathedral
9+ Pound Large Amethyst Crystal Cluster Display Specimen agate geode cathedral
$227.50
Large Amethyst Cathedral Crystal Cluster Display Specimen Quartz Agate Geode
Large Amethyst Cathedral Crystal Cluster Display Specimen Quartz Agate Geode
$227.50
Amazing Large Amethyst Crystal Cluster Geode Cut Base Uruguayan Church
Amazing Large Amethyst Crystal Cluster Geode Cut Base Uruguayan Church
$115.00
Large Size AMETHYST Stone Marble Sphere Beautiful Color 1 3 4 inches
Large Size AMETHYST Stone Marble Sphere Beautiful Color 1 3 4 inches
$18.82
Large Size AMETHYST Stone Marble Sphere Beautiful Color 1 3 4 inches
Large Size AMETHYST Stone Marble Sphere Beautiful Color 1 3 4 inches
$20.27
Large Amethyst Cluster 875 x 45in
Large Amethyst Cluster 875 x 45in
$39.06
X Large Calcite on Amethyst Plate from Rio Grande do Sol Brazil 14302
X Large Calcite on Amethyst Plate from Rio Grande do Sol Brazil 14302
$375.00
AMETHYST CLUSTER OR GEODE LARGE BRAZIL WHAT COLOR GEMY 5LBS 06 OZS 7 X55
AMETHYST CLUSTER OR GEODE LARGE BRAZIL WHAT COLOR GEMY 5LBS 06 OZS 7 X55
$50.00
Large Brandberg Amethyst Quartz Dual Crystal Cluster Lavender Smoky 14 02 509
Large Brandberg Amethyst Quartz Dual Crystal Cluster Lavender Smoky 14 02 509
$18.00
LARGE AMETHYST CRYSTAL FOR CUTTING 12oz ROUGH
LARGE AMETHYST CRYSTAL FOR CUTTING 12oz ROUGH
$4.89
GORGEOUS LARGE POLISHED AMETHYST STALACTITE SLICE
GORGEOUS LARGE POLISHED AMETHYST STALACTITE SLICE
$24.95
Amethyst Crystal Point Scepter  6 Large Crystal Point Scepter
Amethyst Crystal Point Scepter 6 Large Crystal Point Scepter
$24.95
Large Amethyst Crystals from Brazil Rich Purple Large Healing Stones
Large Amethyst Crystals from Brazil Rich Purple Large Healing Stones
$75.00
STUNNING LARGE BRAZILIAN AMETHYST SLAB 45 lbs STAND INCLUDED
STUNNING LARGE BRAZILIAN AMETHYST SLAB 45 lbs STAND INCLUDED
$129.00
Large Spirit Quartz Crystal Plate Sterling Silver Pendant w Amethyst
Large Spirit Quartz Crystal Plate Sterling Silver Pendant w Amethyst
$52.99
Phantom Amethyst Point Natural Uruguay Amethyst Large Crystal in Velvet Bag
Phantom Amethyst Point Natural Uruguay Amethyst Large Crystal in Velvet Bag
$8.99
OUTSTANDING 11+ LB AMETHYST LARGE POINTS SUPERB COLOR  INCLUSIONS BRAZIL
OUTSTANDING 11+ LB AMETHYST LARGE POINTS SUPERB COLOR INCLUSIONS BRAZIL
$148.00
Very Large Multi Colored Gemstone Parrot Carving on Amethyst Geode TOP Quality
Very Large Multi Colored Gemstone Parrot Carving on Amethyst Geode TOP Quality
$275.00
2 Pounds of Amethyst Large Rough Cutting Cabbing Tumble Rocks Reiki
2 Pounds of Amethyst Large Rough Cutting Cabbing Tumble Rocks Reiki
$26.99
Beautiful large Amethyst Quartz crystal geode mineral specimen
Beautiful large Amethyst Quartz crystal geode mineral specimen
$68.00
Large Mineral Rock Stone Specimen Amethyst Cluster 25in Artigas Uruguay Sample
Large Mineral Rock Stone Specimen Amethyst Cluster 25in Artigas Uruguay Sample
$14.94
2 oz AMETHYST CHEVRON BANDED Large 1+ Bulk Tumbled Stone Metaphysical Healing
2 oz AMETHYST CHEVRON BANDED Large 1+ Bulk Tumbled Stone Metaphysical Healing
$3.25
293 Gram Brandberg Enhydro Amethyst Crystal w Prehnite 2 Bubbles Large Cave
293 Gram Brandberg Enhydro Amethyst Crystal w Prehnite 2 Bubbles Large Cave
$120.00
438 Gram Brandberg Enhydro Amethyst Crystal 1 Large Very Long Moving Bubble
438 Gram Brandberg Enhydro Amethyst Crystal 1 Large Very Long Moving Bubble
$250.00
Crystal Allies Materials 3lb Rough Brazilian 10 Stone Mix Large Amethyst Stones
Crystal Allies Materials 3lb Rough Brazilian 10 Stone Mix Large Amethyst Stones
$0.99
Highly Polished Amethyst Cluster Super Color  Quality Very Large Points
Highly Polished Amethyst Cluster Super Color Quality Very Large Points
$299.99
Amethyst Geode Cathedral w Large Dark Points  Rainbows Super Quality
Amethyst Geode Cathedral w Large Dark Points Rainbows Super Quality
$599.99
Large Purple Amethyst Crystal Rock Specimen
Large Purple Amethyst Crystal Rock Specimen
$51.00
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY THE BEST OF THE BEST
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY THE BEST OF THE BEST
$359.00
STUNNING LARGE BRAZILIAN AMETHYST SLAB 27 1 2 lbs
STUNNING LARGE BRAZILIAN AMETHYST SLAB 27 1 2 lbs
$475.00
Large Deep Purple Amethyst Cluster Perfect Terminations Gorgeous Specimen
Large Deep Purple Amethyst Cluster Perfect Terminations Gorgeous Specimen
$6.95
Large Collection of Amethyst Clusters AZ GFCAMEL
Large Collection of Amethyst Clusters AZ GFCAMEL
$102.81
LARGE AMETHYST CRYSTAL CLUSTER GEODE CATHEDRAL FROM URUGUAY
LARGE AMETHYST CRYSTAL CLUSTER GEODE CATHEDRAL FROM URUGUAY
$103.20
LARGE AMETHYST CRYSTAL CLUSTER GEODE CATHEDRAL FROM URUGUAY 136 LBS
LARGE AMETHYST CRYSTAL CLUSTER GEODE CATHEDRAL FROM URUGUAY 136 LBS
$299.99
Large AMETHYST  ARSENOPYRITE Wheal Jane Cornwall UK 14cm
Large AMETHYST ARSENOPYRITE Wheal Jane Cornwall UK 14cm
$8.47
Large Natural AMETHYST CRYSTALINE STALAGTITE Mineral Specimen 42lbs M 29
Large Natural AMETHYST CRYSTALINE STALAGTITE Mineral Specimen 42lbs M 29
$325.00
Large cabinet Amethyst piece from Brazil
Large cabinet Amethyst piece from Brazil
$13.00
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY THE BEST OF THE BEST
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY THE BEST OF THE BEST
$159.00
LARGE RICH DEEP PURPLE AMETHYST QUARTZ CRYSTAL CLUSTER GEODE SPECIMEN 54OZ
LARGE RICH DEEP PURPLE AMETHYST QUARTZ CRYSTAL CLUSTER GEODE SPECIMEN 54OZ
$45.00
LARGE Raw Purple Amethyst 1lb 14oz 42524CT
LARGE Raw Purple Amethyst 1lb 14oz 42524CT
$6.99
Large variety pack Amethyst Rose Tangerine Quartz Crystal Mineral Quartz rock
Large variety pack Amethyst Rose Tangerine Quartz Crystal Mineral Quartz rock
$4.99
Wholesale 10 Pc Large Amethyst Gemstone Tree Geode Crystal Plate 1
Wholesale 10 Pc Large Amethyst Gemstone Tree Geode Crystal Plate 1
$41.00
Wholesale Variety 10 Pc Large Amethyst Gemstone Trees Geode Crystals 5
Wholesale Variety 10 Pc Large Amethyst Gemstone Trees Geode Crystals 5
$20.49
10 Pc Large Amethyst Gemstone Trees Variety Wholesale Geode Crystals 4
10 Pc Large Amethyst Gemstone Trees Variety Wholesale Geode Crystals 4
$19.99
Large Amethyst Spirit or Cactus Quartz Druze Cluster
Large Amethyst Spirit or Cactus Quartz Druze Cluster
$39.99
LRG 27g 100 Natural Rough Cheveron Amethyst Auralite 21 Secret 7 Purple Crystal
LRG 27g 100 Natural Rough Cheveron Amethyst Auralite 21 Secret 7 Purple Crystal
$1.54
1 2 lb AMETHYST CHEVRON BANDED Large 1 Bulk Tumbled Stone Metaphysical Healing
1 2 lb AMETHYST CHEVRON BANDED Large 1 Bulk Tumbled Stone Metaphysical Healing
$8.50
1 4 lb AMETHYST CHEVRON BANDED Large 1 Bulk Tumbled Stone Metaphysical Healing
1 4 lb AMETHYST CHEVRON BANDED Large 1 Bulk Tumbled Stone Metaphysical Healing
$4.50
Large 90 x 80 Very Dark Uruguayan Amethyst Crystals Geode Plate Church 9C
Large 90 x 80 Very Dark Uruguayan Amethyst Crystals Geode Plate Church 9C
$15.50
Large End Cut Slab of AZ Amethyst Lace for Cab Cutting Rough or Mineral Specimen
Large End Cut Slab of AZ Amethyst Lace for Cab Cutting Rough or Mineral Specimen
$1.25
Large Face Cut Piece AZ Amethyst Lace for Cab Cutting Rough or Mineral Specimen
Large Face Cut Piece AZ Amethyst Lace for Cab Cutting Rough or Mineral Specimen
$6.99
Large Uncut Piece of AZ Amethyst Lace with Druse Cab Cutting Rough or Specimen
Large Uncut Piece of AZ Amethyst Lace with Druse Cab Cutting Rough or Specimen
$1.25
LARGE URUGUAY AMETHYST CRYSTAL CLUSTER GEODE W WOODEN STAND STALACTITE BASE
LARGE URUGUAY AMETHYST CRYSTAL CLUSTER GEODE W WOODEN STAND STALACTITE BASE
$71.96
Amethyst Cluster From Brazil 4 lbs 9 ounces Exc Color Blend Large Points
Amethyst Cluster From Brazil 4 lbs 9 ounces Exc Color Blend Large Points
$59.00
Crystal Allies Materials 1lb Tumbled Amethyst Stones Large 1 Mixed Quality
Crystal Allies Materials 1lb Tumbled Amethyst Stones Large 1 Mixed Quality
$0.99
Large Russian Amethyst Mineral Specimen
Large Russian Amethyst Mineral Specimen
$69.90
Large Amethyst Geode 35 lbs
Large Amethyst Geode 35 lbs
$3,750.00
Large amethyst skull made in Brazil 3 lbs
Large amethyst skull made in Brazil 3 lbs
$400.00
NATURAL AMETHYST DRUZE GEODE LARGE CRYSTAL AMETHYST 1038 Grams NR
NATURAL AMETHYST DRUZE GEODE LARGE CRYSTAL AMETHYST 1038 Grams NR
$9.50
Large Amethyst quartz bonsai tree W dark AMETHYST GEODE BASE 12T 12 W
Large Amethyst quartz bonsai tree W dark AMETHYST GEODE BASE 12T 12 W
$150.00
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY CATHEDRAL
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY CATHEDRAL
$111.96
LARGE PURPLE AMETHYST QUARTZ CRYSTAL SPECIMEN 4 OZ
LARGE PURPLE AMETHYST QUARTZ CRYSTAL SPECIMEN 4 OZ
$24.95
Stunning Large Amethyst Specimen Weighs 2lbs 93oz
Stunning Large Amethyst Specimen Weighs 2lbs 93oz
$100.00
Large Brandberg Amethyst Double Terminated Quartz Crystal Handheld 14 03 156
Large Brandberg Amethyst Double Terminated Quartz Crystal Handheld 14 03 156
$32.00
DINO Large Natural Green AMETHYST CRYSTAL Wands 299 gr Healing
DINO Large Natural Green AMETHYST CRYSTAL Wands 299 gr Healing
$9.99
Large Long 232 lb Natural Amethyst Crystal Cluster Plate Druzy Matrix Display
Large Long 232 lb Natural Amethyst Crystal Cluster Plate Druzy Matrix Display
$7.00
Large Brandberg Amethyst Quartz Crystal Dark Lavender Hue Purple Plume 14 03 111
Large Brandberg Amethyst Quartz Crystal Dark Lavender Hue Purple Plume 14 03 111
$48.00
Large Brandberg Amethyst Double Terminated Quartz Crystal Sheathed 14 03 166
Large Brandberg Amethyst Double Terminated Quartz Crystal Sheathed 14 03 166
$32.00
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY CATHEDRAL
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY CATHEDRAL
$239.96
AMETHYST Lilac Banded large tumbled 1 2 lb bulk stones Chevron quartz lavender
AMETHYST Lilac Banded large tumbled 1 2 lb bulk stones Chevron quartz lavender
$15.99
LARGE AMETHYST FRAGMENT 1 LBS 4 OZ 5 in x 5 in x 15 in DISPLAY STONE ROCK
LARGE AMETHYST FRAGMENT 1 LBS 4 OZ 5 in x 5 in x 15 in DISPLAY STONE ROCK
$35.00
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY CATHEDRAL
LARGE AMETHYST CRYSTAL CLUSTER GEODE FROM URUGUAY CATHEDRAL
$111.96
Large Amethyst Cluster
Large Amethyst Cluster
$50.00
Large Espirito de Santo Smoky Amethyst  Quartz Polished Point
Large Espirito de Santo Smoky Amethyst Quartz Polished Point
$275.00
Crystal Allies Materials 5lb Wholesale Rough Amethyst Stones Large 1
Crystal Allies Materials 5lb Wholesale Rough Amethyst Stones Large 1
$29.95
Crystal Allies Materials 11lb Wholesale Rough Amethyst Stones Large 1
Crystal Allies Materials 11lb Wholesale Rough Amethyst Stones Large 1
$54.95
Amethyst Cathedral Church Large Deep Crystal Specimen
Amethyst Cathedral Church Large Deep Crystal Specimen
$260.00
Amethyst Cathedral Church Large Purple Crystal Formation
Amethyst Cathedral Church Large Purple Crystal Formation
$490.00
Amethyst Cathedral Large Purple Quartz Geode
Amethyst Cathedral Large Purple Quartz Geode
$900.00
Large Brandberg Amethyst Quartz Crystal Dark Lavender Hue Bubble 14 02 479
Large Brandberg Amethyst Quartz Crystal Dark Lavender Hue Bubble 14 02 479
$21.00
Large Amethyst Cathedral Church Cave Wide Crystal Formation
Large Amethyst Cathedral Church Cave Wide Crystal Formation
$425.00
Large Amethyst Cathedral Church Crystal Specimen
Large Amethyst Cathedral Church Crystal Specimen
$390.00
Large Amethyst Cathedral Church Cave Formation
Large Amethyst Cathedral Church Cave Formation
$460.00
Large Amethyst Cluster Crystal Specimen
Large Amethyst Cluster Crystal Specimen
$590.00
Large Brandberg Amethyst Quartz Crystal Lavender and Smoky Hue Rainbow 14 03 159
Large Brandberg Amethyst Quartz Crystal Lavender and Smoky Hue Rainbow 14 03 159
$68.00
Large Brandberg Amethyst Quartz Crystal Cluster Dark Lavender Phantoms 14 03 77
Large Brandberg Amethyst Quartz Crystal Cluster Dark Lavender Phantoms 14 03 77
$42.00
Large 2 LB 10oz Amethyst Quartz Crystal Geode Plate
Large 2 LB 10oz Amethyst Quartz Crystal Geode Plate
$25.00
Large Brandberg Amethyst Quartz Crystal Dark Lavender Hue Purple Plume 14 03 108
Large Brandberg Amethyst Quartz Crystal Dark Lavender Hue Purple Plume 14 03 108
$48.00
Large 222lb Amethyst Crystal Cluster with Crazy Inclusions Druzy Matrix
Large 222lb Amethyst Crystal Cluster with Crazy Inclusions Druzy Matrix
$15.00
2 Large Uncut Thunder Egg Pieces with Pale Amethyst Crystals for Specimens
2 Large Uncut Thunder Egg Pieces with Pale Amethyst Crystals for Specimens
$2.25
Large Uncut Piece of Big Horn Amethyst Lace with Crystals for Mineral Specimen
Large Uncut Piece of Big Horn Amethyst Lace with Crystals for Mineral Specimen
$1.25



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