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A DEFINITIVE GEOLOGICAL RECORD. CATALOGING SPECIMENS ACROSS THE WORLD'S MOST SOUGHT-AFTER FAMILIES.

Achroite

TOURMALINE (ELBAITE VARIETY) · CYCLOSILICATE (BOROSILICATE) MOHS 7–7.5

Afghanite

FELDSPATHOID · CANCRINITE GROUP (TECTOSILICATE) MOHS 5.5–6

MOHS

Agate

QUARTZ MOHS 6.5–7

Ajoite

COPPER SILICATE (IN QUARTZ) MOHS 6.5–7

Alexandrite

CHRYSOBERYL MOHS 8.5

Almandine

SILICATE (GARNET GROUP) MOHS 7–7.5

Amazonite

FELDSPAR MOHS 6–6.5

Amber

ORGANIC (FOSSILIZED RESIN) MOHS 2–2.5

Amethyst

QUARTZ MOHS 7

Ametrine

QUARTZ MOHS 7

Ammolite

ORGANIC (FOSSILIZED SHELL) MOHS 3.5–4

Andalusite

NESOSILICATE MOHS 6.5–7.5

Chiastolite

ALUMINUM SILICATE MOHS 6.5–7.5

Angelite

ANHYDRITE MOHS 3.5

Anglesite

SULFATE MOHS 2.5–3

Ankerite

CARBONATE MOHS 3.5–4

Antigorite

PHYLLOSILICATE (SERPENTINE GROUP) MOHS 3.5–4

Apatite

PHOSPHATE MOHS 5

Apophyllite

PHYLLOSILICATE MOHS 4.5–5

Aquamarine

BERYL MOHS 7.5–8

Aquatine Calcite

CARBONATE MOHS 3

Aragonite

CARBONATE MOHS 3.5–4

Arfvedsonite

INOSILICATE (AMPHIBOLE) MOHS 5–6

Aura Quartz

QUARTZ (MAN-ENHANCED) MOHS 7

QUARTZ MOHS

CARBONATE MOHS

MOHS

QUARTZ (CHALCEDONY) MOHS 6.5–7

Azurite

CARBONATE MOHS 3.5–4

Barite

SULFATE MOHS 3–3.5

Benitoite

CYCLOSILICATE MOHS 6–6.5

MOHS

Red Beryl

BERYL MOHS 7.5–8

Bismuth Crystal

NATIVE ELEMENT MOHS 2–2.5

Black Kyanite

NESOSILICATE MOHS 4.5–7 (variable by direction)

Black Tourmaline

CYCLOSILICATE MOHS 7–7.5

Bloodstone

QUARTZ (CHALCEDONY) MOHS 6.5–7

Blue Apatite

PHOSPHATE MOHS 5

Blue Aragonite

CARBONATE MOHS 3.5–4

Blue Calcite

CARBONATE MOHS 3

Blue Halite

HALITE MOHS 2.5

Blue John Fluorite

HALIDE MOHS 4

Blue Kyanite

NESOSILICATE MOHS 4–7 (variable)

Blue Lace Agate

QUARTZ (CHALCEDONY) MOHS 6.5–7

Blue Onyx

QUARTZ (CHALCEDONY) MOHS 6.5–7

Blue Tiger’s Eye

QUARTZ (SILICON DIOXIDE) MOHS 6.5–7

MOHS
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