Polished orbicular jasper (likely ocean jasper)
Microcrystalline quartz (SiO₂) with iron oxides and accessory minerals
mineral
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
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Rose Quartz
Silicon Dioxide (SiO2)
mineral
Green Chert (Jasper)
Microcrystalline Quartz (SiO2) with chlorite/epidote inclusions
sedimentary
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Tektite
Impactite (Natural Silicate Glass)
meteorite
Banded Gneiss (with Quartz Vein)
Gneiss (SiO2 and varied Silicates)
metamorphic
Amygdaloidal Basalt with Epidote
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Blue Quartz
Silicon Dioxide (SiO2) with fibrous inclusions (such as tourmaline, magnesio-riebbeckite, or crocidolite)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz Vein in Basalt or Porphyry
Silicate-veined volcanic rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
White Chalcedony (likely Common Opal or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Felted Quartz / Chlorite Quartz
Chlorite included Quartz (SiO2 + (Mg,Fe)3(Si,Al)2O5(OH)4)
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Quartz with Magnetite or Schorl inclusion
Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4
metamorphic
Hemimorphite on Limonite Gossan
Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix
mineral
Yellow calcite fragment
Calcite (CaCO₃), likely honey/yellow calcite
mineral
Light-colored quartz-rich stone, possibly milky quartz
Quartz (SiO₂), provisional identification
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Pink Granite (Unakite-bearing Granite Pebble)
Granite (rich in Potassium Feldspar / Orthoclase)
igneous
Mixed rock fragments, likely basalt and weathered granite
Probable mafic volcanic rock (basalt) with granitoid fragments; exact identification is uncertain from the image
igneous
Mixed Gemstone and Mineral Collection
Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)
mineral
Obsidian
Volcanic glass (SiO2-rich amorphous silicate)
igneous
Amygdaloidal Basalt with Agate/Quartz Infill
Basalt with Secondary Silicate Mineralization (SiO2)
igneous
Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Diorite
Intermediate plutonic igneous rock
igneous
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Bauxite
Bauxite (Aluminum Ore)
sedimentary
Yellow Beryl (Heliodor)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral