Green Fluorite
Calcium Fluoride (CaF2)
mineral
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
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Fossilized oyster shell
Ostrea/Exogyra sp.; calcium carbonate (mostly calcite)
fossil
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Quartz-rich pegmatite (likely mica-bearing granite)
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica (muscovite/biotite)
igneous
Polished bumblebee jasper (likely Indonesian orbicular jasper)
Jasper: microcrystalline quartz (SiO₂), with iron oxides and volcanic/mineral inclusions
mineral
Polished orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron oxides and accessory minerals; SiO₂-dominant
mineral
Weathered iron-rich rock, possibly oxidized basalt or laterite
Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)
igneous
Gneiss
Gneiss
metamorphic
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fluorite (Fluorescent)
Calcium Fluoride (CaF2)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Demitasse Granite (Diorite-Granite transition)
Intermediate Plutonic Rock (Granodiorite/Diorite mix)
igneous
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Basalt with Amygdule
Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill
igneous
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Limonite (with Goethite/Hematite glaze)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Limonite (Iron Ore/Bog Iron)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pink Granite (Unakite-bearing or Epidote-bearing Granite)
Plutonic Igneous Rock (Granite)
igneous
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Small rounded tan pebble, likely quartz-rich river stone
Indeterminate; possibly quartz or quartzite (predominantly SiO₂)
sedimentary
Pebble with vesicles, likely basalt
Vesicular basalt; chiefly plagioclase, pyroxene, and iron-magnesium minerals
igneous
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Gray rock (possibly basalt or fine-grained granite)
Undetermined; no diagnostic minerals are visible
igneous
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary