Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Gastropod Steinkern (Fossilized Snail Cast)
Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)
Sedimentary
Limestone (Flagstone)
Fossiliferous Limestone (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Druzy Quartz (on Quartzite or Chert)
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond in Matrix
Quartz (SiO2) in Dolostone (CaMg(CO3)2)
sedimentary (host) / mineral (crystals)
Unakite
Epidotized Granite
metamorphic
Gossan with Copper Carbonate (Chrysocolla/Malachite)
Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
Mineral/Sedimentary Interface
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Wishing Stone (Basalt with Quartz Vein)
Basalt containing a microcrystalline quartz (SiO2) or calcite vein
igneous
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
metamorphic
Wishing Stone (Basalt/Greywacke with Quartz Vein)
Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion
igneous/sedimentary
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Fossilized Brachiopod/Bivalve in Limestone
Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)
sedimentary
Unakite
Unakite (altered granitic rock)
metamorphic
Scoria (Lava Rock)
Scoria
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Metagabbro / Epidote Gneiss
Epidote bearing Hornblende Gneiss
metamorphic
Fossiliferous Limestone (Crinoidal)
Bioclastic Limestone (predominantly CaCO3)
sedimentary
Red Sandstone (Old Red Sandstone)
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
Quartzite (Milky)
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Granite
Intrusive Igneous Rock (composed primarily of Quartz: SiO2, Feldspar: KAlSi3O8, and Mica: KAl2(AlSi3O10)(OH)2)
igneous
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Pearls
Aragonite (calcium carbonate) and Conchiolin
Mineraloid
Granite
Granite
Igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Pumice
Pumicite (Amorphous glass with varying chemical composition, often rhyolitic)
Igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous