how would a collector of minerals determine the hardness of an unknown mineral specimen?
The Scratch Test. See if the mineral scratches a piece of glass (hardness of 5). If it does, see if it scratches a piece of quartz (hardness of 7) if it doesn’t, see if it scratches a piece of calcite (hardness of 3). If it scratches quartz it has hardness greater than 7. If it scratches glass but not quartz it has a hardness between 5 and 7. If it scratches calcite but not glass it has a hardness between 3 and 5. If it doesn’t scratch calcite it has a hardness less than 3.
1.1ct RED BERYL (Bixbite) Crystals-Violet Claim UT
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $13.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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got minerals? MINERAL SPECIMEN ROCK ROCKS TEE T-SHIRT $16.98 |
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Quartz crystal mineral specimen from Orange River $22.01 |
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Quartz crystal mineral specimen from Orange River $39.55 |
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Quartz crystal mineral specimen from Orange River $29.03 |
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Quartz crystal mineral specimen from Orange River $51.83 |
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Minerals – Coprolite Specimen $12.50 |
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Minerals – Coprolite Specimen $11.25 |
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Minerals – Coprolite Specimen $20.00 |
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Chrome Diopside Crystal mineral specimen. Ref:4.CD1 $9.89 |
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mineral TWO WULFENITE CRYSTAL THUMBNAIL SPECIMENS RED CLOUD MINE! $25.00 |
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Beautiful huge 9 oz Arizona Slaughter Mt. fire agate mineral specimen! $9.99 |
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Beautiful bubbly 30 g Arizona fire agate mineral specimen! $6.99 |
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15.8Lbs Red Calcite Mineral Crystal Specimen! $375.00 |
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Heulandite Crystal Mineral Specimen #IN259 $3.99 |
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Red Calcite Crystal Mineral Specimen #RC-7 $7.99 |
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Apophyllite Crystal Mineral Specimen #IN72 $5.99 |
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Apophyllite-Stilbite Crystal Mineral Specimen #D-982 $3.99 |
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Apophyllite-Stilbite Crystal Mineral Specimen #D-1115 $3.99 |
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Rose Quartz Windows Crystal Mineral Specimen #RQ3 $4.99 |
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Apophyllite-Stilbite Crystal Mineral Specimen #IN263 $2.99 |
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Apophyllite Crystal Mineral Specimen #D-1233 $7.99 |
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Apophyllite Crystal Mineral Specimen #IN245 $3.99 |
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Apophyllite Crystal Mineral Specimen #IN164 $3.99 |
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Agatized Coral Geode Mineral Specimen $175.00 |
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Labradorite Mineral Specimen $140.00 |
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Beautiful huge 8 oz Arizona fire agate mineral specimen! $9.99 |
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Beautiful bubbly 16 ounce Arizona fire agate mineral specimen! $9.99 |
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Beautiful large 5 oz Arizona fire agate mineral specimen! $7.99 |
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31mm(1.2″) Andalusite Chiastolite Sphere/ball,Mineral Specimen 692 $9.99 |
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5 RED CALCITE ROUGH MINERAL STONE CRYSTAL HEALING CHUNK SPECIMEN REIKI $0.99 |
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BLUE GREEN AMAZONITE 572gr PERU GEM REIKI COLLECTOR MINING MINERAL SPECIMEN A22 $4.99 |
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1.4cm PROUSTITE ACANTHITE RUBY SILVER PYRARGYRITE COLLECTOR MINERAL SPECIMEN H73 $9.99 |
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2.1cm PROUSTITE ACANTHITE RUBY SILVER PYRARGYRITE COLLECTOR MINERAL SPECIMEN H75 $9.99 |
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1.7cm PROUSTITE ACANTHITE RUBY SILVER PYRARGYRITE COLLECTOR MINERAL SPECIMEN H82 $9.99 |
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1.5cms NATIVE SILVER WIRES PROUSTITE PERU MINING MINERAL COLLECTOR SPECIMEN H25 $9.99 |
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31grs PEACOCK COPPER COLLECTORS REIKI MINER MINERAL SPECIMEN PERU Z20 $9.99 |
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2cm PROUSTITE ACANTHITE RUBY SILVER PYRARGYRITE COLLECTOR MINERAL SPECIMEN H80 $9.99 |
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8.5cms HUEBNERITE PERU QUARTZ COLLECTORS GEM REIKI MINERAL SPECIMEN N54 $4.99 |
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2.5cts RHODOCHROSITE CRYSTAL COLLECTORS REIKI PERU MINERAL SPECIMEN R410 $4.99 |
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Rare Yellow Iron Stone Mineral Mineral Specimen 02 $9.99 |
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Beautiful bubbly 24 g Arizona fire agate mineral specimen! $9.99 |
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Beautiful huge 9 oz Arizona Slaughter Mt. fire agate mineral specimen! $14.99 |
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BEAUTIFUL GOLD Leaf Crystal Fine Mineral Specimen Baie Verte NEWFOUNDLAND $144.95 |
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(R-69) Real specimens GEM gemstone Mineral IDENTIFICATION I.D. ID chart rock $17.99 |
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11.8Lbs Red Calcite Mineral Crystal Specimen! $300.00 |
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LAZULITE ON QUARTZ Fine Mineral Specimen Yukon, Canada $575.00 |
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LAZULITE ON QUARTZ Fine Mineral Specimen Yukon, Canada $395.00 |
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Bisbee Arizona Calcite Mineral Specimen Bisbee Ice malachite #2 $0.99 |
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5.3 cm. Hollow CROCOITE Crystal, Australia – Mineral Specimen for Sale $55.00 |
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4.3 cm. Green Botryoidal CUPROADAMITE Crystals – Mineral Specimen for Sale $40.00 |
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Fluorescent Mineral,27g Ruby Crystal,Mineral Specimen $0.99 |
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Fluorescent/Phosphorescent Mineral,43g Brown Fluorite Crystal,Mineral Specimen $0.99 |
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Fluorescent Mineral,9g Garnet Crystals on Smokey Quartz,Mineral Specimen $0.99 |
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Fluorescent Mineral,33g wulfenite Crystals on Rock,Mineral Specimen $0.99 |
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Fluorescent Mineral,34g wulfenite Crystals on Rock,Mineral Specimen $0.99 |
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Fluorescent Mineral,32g Pink Tourmaline Crystal with Mica,Mineral Specimen $0.99 |
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Fluorescent Mineral,24g Lapis Lazuli Specimen $0.99 |
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Fluorescent Mineral,26g Lapis Lazuli Specimen $0.99 |
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Fluorescent Mineral,19g Sodalite Crystal,Mineral Specimen $1.25 |
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5.5″ POT FERR & CHALCANTHITE Mineral Crystal Cluster Display Specimen $132.00 |
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5.25″ POT FERR & CHALCANTHITE Mineral Crystal Cluster Display Specimen $132.00 |
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3.3 cm. ALGODONITE & DOMEYKITE Nugget, Michigan – Mineral Specimen for Sale $49.99 |
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3 Heads Agatized Coral Head Withlacoochee Florida Mineral Specimen Knapp Tumble $24.00 |
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5.06Lbs Absolutely Purple Fluorite Mineral Specimen! $395.00 |
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4.9 cm. Rare KOTTIGITE Crystal Cluster, Mexico – Mineral Specimen for Sale $48.00 |
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3.25″ Clear Green Fluorite Mineral Display Specimen! $64.99 |
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3.25″ Clear Green Fluorite Mineral Display Specimen! $39.99 |
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EXQUISITE SERANDITE Fine Mineral Specimen Crystal Mont Saint Hilaire CANADA $125.00 |
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Stilbite Crystal Mineral Specimen #IN102 $19.99 |
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Apophyllite Crystal Mineral Specimen #IN100 $24.99 |
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Apophyllite-Stilbite Crystal Mineral Specimen #IN105 $19.99 |
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Apophyllite-Stilbite Crystal Mineral Specimen #IN125 $24.99 |
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Selenite Ram-Horn Gypsum Crystal Mineral Specimen D-278 $11.99 |
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Apophyllite Crystal Mineral Specimen #IN109 $19.99 |
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Calcite Crystal Mineral Specimen #D-193 $14.99 |
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2.5″ Clear Green Fluorite Mineral Display Specimen! $39.99 |
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4″ PYRITE CUBE CLUSTER MINERAL SPECIMEN CRYSTAL from CHIHUAHUA, MEXICO T2/B48 $125.00 |