Glacial Cobbles (predominantly Granite and Gneiss)
Mixed lithologies (Quartz, Feldspar, Mica assemblage)
igneous and metamorphic
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
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Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Gabbro (likely with Pyrite/Sulfide mineralization)
Mafic Intrusive Igneous Rock
igneous
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Purple Aventurine
Quartzite with Lepidolite (SiO2 + K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
metamorphic
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6)
mineral
Rough Quartz (with Feldspar inclusions)
Silicon Dioxide (SiO2)
Mineral
Sapphirine in Matrix
Sapphirine (Mg,Al)8(Al,Si)6O20
mineral
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Quartz with Chalcopyrite
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Porphyritic Basalt (with Amygdales)
Amygdaloidal Porphyritic Basalt
igneous
Satin Spar Gypsum
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Mineral
Beryllonite
Beryllonite (NaBePO4)
mineral
Earthy Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Granitoid (comprised of Quartz, Feldspar, and Mica)
igneous
Blue Kyanite
Kyanite (Al2SiO5)
metamorphic
Micro-Meteorite (Micrometeoroid)
Extraterrestrial Spherule (Silicate or Iron-Nickel)
mineral
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Marble
Metamorphosed Limestone (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Greenschist / Migmatite
Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)
metamorphic
Tiger Iron / Banded Iron Formation
Banded Iron Formation (SiO2 with Fe2O3 and FeOOH)
metamorphic
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (SiO2 secondary)
sedimentary
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary