Quartz Mineral
Silicon Dioxide (SiO2)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Quartz Mineral
Silicon Dioxide (SiO2)
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
Blue Calcite
Calcium Carbonate (CaCO3)
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Gneiss
Gneiss (High-grade metamorphic rock)
Pyrite in Matrix (often with Chalcopyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
Quartz Fragment
Silicon Dioxide (SiO2)
Calcite (Optical or Clear Calcite)
Calcium Carbonate (CaCO3)
Quartz
Silicon dioxide (SiO2)
Calcite
Calcium Carbonate (CaCO3)
Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Pyrite
Iron Pyrite (FeS2)
Pyrite in Matrix
Iron Disulfide (FeS2)
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
Dalmatian Stone
Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
Magnetite
Magnetite (Fe3O4)
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
Quartz
Silicon Dioxide (SiO2)
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
Green Calcite
Calcium Carbonate (CaCO3)
Clear Quartz
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite
Iron Sulfide (FeS2)
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
Blue Chalcedony
Silicon Dioxide (SiO2)
Garnet
Garnet group [X3Y2(SiO4)3]
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Milky Quartz (Ferruginous variety)
Silicon Dioxide (SiO2)