Granite
Granite
igneous
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
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Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)
mineral
Ferruginous Quartz
Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)
mineral
Pyrite (on host rock/ore)
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Siltstone with Quartz Vein
Siltstone (primarily SiO2, Al2O3, Fe2O3)
sedimentary
Basalt with Calcite Veins
Basalt (Mafic Volcanic Rock)
igneous
Granite
Granite (Phaneritic igneous rock)
igneous
Quartz Vein in Mica Schist
Quartz (SiO2) with Muscovite/Biotite Schist
metamorphic
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz Geode
SiO2 (Silicon Dioxide)
sedimentary
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Limestone with fossil crinoid stems
Calcium Carbonate (CaCO3) containing Crinoidea fossils
sedimentary
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)
metamorphic
Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
mineral
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Chert (containing Flint and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Crushed Rock (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Clear Quartz (Carved Dragon)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite (Yellow/Iron-Stained)
Quartzite (SiO2 with Iron Oxide impurities)
metamorphic
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Gold and Silver (Metal Components of an Antique Pocket Watch)
Native Gold (Au) and Native Silver (Ag)
mineral
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
Mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral