Pyrite
Iron Sulfide (FeS2)
mineral
Category
Igneous And Sedimentary
Browse igneous and sedimentary specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz-rich pebble
Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment
mineral
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Geode (Unopened)
Quartz/Chalcedony concretion
sedimentary
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Jasper pebble)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Likely rough quartz with iron-oxide staining
Quartz (SiO₂), possibly with iron-oxide inclusions or surface staining
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Feldsphathic Igneous Rock
igneous
Quartz Crystal
Silicon Dioxide (SiO2)
mineral