Note regarding baguette production (not a rock)
Digital text image - Somali language
not a rock
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Bauxite
Bauxite (Aluminum Ore)
sedimentary
Lapis Lazuli (Tumbled Specimen)
Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Fluorite
Calcium fluoride (CaF2)
mineral
Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
Greenstone
Metabasalt / Chlorite Schist
metamorphic
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Granitic Pegmatite
Pegmatite containing Quartz, Feldspar, and Muscovite mica
igneous
Milky Quartz Mineral
Quartz (Silicon Dioxide, SiO2)
mineral
Mixed Mineral Specimens
Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)
mineral
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
White Quartz with Black Tourmaline
Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limonite
Limonite (FeOO·nH2O)
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Glacial Granite with Epidote
Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions
mineral
Chrysocolla on Quartz with Iron Oxides
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)
mineral
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral