Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral Like Biological Tissue
Browse mineral like biological tissue specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
White Chalcedony (likely Common Opal or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Gemstone Tree Brooch (Agate and Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Quartz (SiO2) within a sedimentary/igneous host
mineral
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Malachite
Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2
Mineral
Tumbled Quartz (Peach Quartz / Red Quartz)
Silicon Dioxide (SiO2)
mineral
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Ammonite Fossil in Matrix
Ammonoidea subclass (e.g., Arietites or similar genera)
fossil
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Schist
Mica Schist (Variable chemistry, often rich in muscovite and biotite)
metamorphic
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Gneiss
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Schist
Mica Schist
metamorphic
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Chrysocolla with Malachite
Cu2-xAlx(H2-xSi2O5)(OH)4%CnH2O (Chrysocolla)
mineral
Microcline (Potassium Feldspar)
Microcline (KAlSi3O8)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
mineral
Chert / Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Rutilated Quartz
Silicon Dioxide (SiO2) with inclusions of Rutile (TiO2)
mineral
Gneiss
Gneiss
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Likely schist, possibly serpentinite
Mica schist; potential chlorite–serpentine-rich metamorphic rock
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Obsidian (Apache Tear)
Volcanic Glass (High-silica Rhyolite)
igneous
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Gneiss
Gneiss
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Schist
Mica Schist
metamorphic
Raw Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral