Diamond
Diamond (Pure Carbon, C)
mineral
Category
Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)
Browse organic gemstone (not a rock or mineral in the traditional sense, but bio mineralized material) specimens identified by the Rock Identifier community.
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)
igneous
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles
Mixed gemstones (primarily Silicon Dioxide - SiO2)
mineral
Amethyst (Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Unidentifiable Rock Fragment
Uncertain
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Carnelian (Orange Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)
sedimentary
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Garnet
Almandine formula: Fe3Al2(SiO4)3
mineral
Montana Moss Agate
Chalcedony (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Citrine or Yellow Quartzite pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)
mineral
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Almandine Garnet in Schist Matrix
Almandine - Fe3Al2(SiO4)3
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Unakite (Epidotized Granite)
Epidote-Feldspar-Quartz Rock
metamorphic
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral