Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
Category
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
Olivine (in Peridotite/Dunite form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
Rhodochrosite
Manganese Carbonate (MnCO3)
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
Citrine
Silicon Dioxide (SiO2)
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Olivine (Peridot)
Olivine (Mg, Fe)2SiO4
Magnetite (Iron Ore)
Magnetite (Fe3O4)
Quartz
Quartz (SiO2)
Arfvedsonite (often mistakenly sold as Astrophyllite)
Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]
Lapis Lazuli (polished cabochon)
Lazurite-rich rock (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2)
Yellow Diamond (Faceted)
Diamond (C - Pure Carbon)
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
Quartz (Milky Quartz Pebble)
Silicon Dioxide (SiO2)
Gold
Native Gold (Au)
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Hematite
Hematite (Fe2O3)
Hematite Beads
Hematite (Fe2O3)
Limonite (also known as Yellow Ochre or Brown Hematite)
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Porphyritic Andesite
Intermediate Volcanic Rock - Andesite
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)
Olivine in Basalt
Peridotite / Forsterite ((Mg,Fe)2SiO4)
Granite
Intrusive igneous rock (high SiO2)
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
Barite Rose (Desert Rose)
Barium Sulfate (BaSO4)
Quartzite
Quartzite (SiO2)
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Magnetite
Magnetite (Fe3O4)
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
Hematite
Hematite (Fe2O3)
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
Rhodochrosite (Beads) and Citrine (Pendant)
Rhodochrosite (MnCO3) and Quartz variety Citrine (SiO2)
Scoria
Vesicular Basaltic Glass
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Basalt
Extrusive mafic igneous rock