Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
Category
Browse sedimentary mineral specimens identified by the Rock Identifier community.
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
Gneiss
Gneiss (foliated metamorphic rock)
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
Quartz
Silicon Dioxide (SiO2)
Red Sandstone
Clastic Sedimentary Rock
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
Limonite Concretion
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)wnH2O)
Purple Chalcedony
Silicon Dioxide (SiO2)
Travertine
Calcium Carbonate (CaCO3)
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Pink Quartz
Silicon Dioxide (Quartz), SiO2
Mica
Mica group (often Muscovite or Biotite)
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
Hematite
Iron(III) oxide (Fe2O3)
Rhodochrosite
Manganese carbonate (MnCO3)
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
White Calcite
Calcium Carbonate (CaCO3)
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
Sandstone
Arenite
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Quartz Geode
Silicon Dioxide (SiO2)
Satin Spar (Gypsum)
Hydrous calcium sulfate (CaSO4·2H2O)
Magnetite
Magnetite (Fe3O4)
Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Quartz Geode
Silicon Dioxide (SiO2)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Yellow Quartz
Silicon Dioxide (SiO2)
Chalcedony with Quartz
Silicon Dioxide (SiO2)
Quartz with Iron Staining
Silicon Dioxide (SiO2)
Quartz Geode
Silicon dioxide (SiO2)
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Limonite Concretion
Goethite/Limonite concretion (FeO(OH)·nH2O)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Yellow Quartz
Silicon Dioxide (SiO2)