Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Clear Quartz (Double Terminated)

Silicon Dioxide (SiO2)

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Schist

Schist (various mineral compositions)

Metamorphic

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Jasper (specifically Fancy or Polychrome Jasper)

Silicon Dioxide (SiO2) - Chalcedony

Sedimentary

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

mineral / metamorphic

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)

Granitic Pegmatite

Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Synthetic (not a rock or mineral)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Smoky Quartz

Silicon Dioxide (SiO2)

metamorphic (man-made / anthropic)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Dalmatian Jasper (Dalmatian Stone)

Perthitic feldspar with Arfvedsonite inclusions

Hypersthene

Hypersthene (Enstatite variety), (Mg,Fe)SiO3

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

sedimentary

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Amethyst

Silicon dioxide (SiO2) with iron impurities

Common Opal with Host Rock

Opal (Hydrated silica, SiO2·nH2O)

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Fluorite in Host Rock

Calcium Fluoride (CaF2)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Green Fluorite

Calcium Fluoride (CaF2)

Ruby in Zoisite (Anyolite)

Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))

metamorphic

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Sedimentary Rock

Serpentine (variety: Serpentine Rock)

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

metamorphic

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Citrine

Citrine (Silicon Dioxide - SiO2)

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Apatite Sphere (Polished)

Fluorapatite / Ca5(PO4)3F

Blue Sapphire

Corundum (Al2O3)