Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Igneous Or Sedimentary (Anthropogenic Modification)
Browse igneous or sedimentary (anthropogenic modification) specimens identified by the Rock Identifier community.
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Magnetite / Hematite mix (Iron Ore)
Fe3O4 (Magnetite) / Fe2O3 (Hematite)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
igneous
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Dalmatian Stone (Dalmatian Jasper)
Dalmatian Stone (A variety of Perthite / Aplite)
Igneous
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Dalmatian Stone
Peralkaline rhyolite
igneous
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Feldsphathic Igneous Rock
igneous
Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
Sedimentary
River Stone (Basalt or Siltstone with banding)
Polished Basaltic or Siliciclastic River Cobble
igneous or sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Carnelian
Carnelian (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)
igneous
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Dalmatian Stone
Dalmatian Jasper (actually a Peralkaline Igneous Rock)
igneous