Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
Gold Ore in Quartz
Auriferous Quartz (Gold: Au; Quartz: SiO2)
Mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone
Arenite (CaCO3/SiO2 cemented quartz)
sedimentary
Ferruginous Sandstone (with Pyrite/Gold associations)
Ferruginous Arenite (SiO2 + Fe2O3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone (composed of clastic quartz and feldspar)
sedimentary
Limonite (Ironstone) Concretion
FeO(OH)·nH2O (Hydrous ferric oxide)
sedimentary
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Goniatite Fossil
Goniatitida (Order), fossilized in limestone/calcite (CaCO3)
sedimentary
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Ironstone Concretion (Siderite Nodules)
Siderite (FeCO3) in Mudstone or Sandstone matrix
sedimentary
Siltstone
Siltstone
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Moonstone
Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
mineral
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Lapis Lazuli
Complex rock primarily of Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2), with Pyrite and Calcite
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock; (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Ironstone Concretion (Moqui Marble Type)
Goethite/Hematite-cemented Sandstone Concretion
sedimentary
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Chert (Yellow Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Graphite
Graphite (C)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral