Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Category
Sedimentary Or Igneous Associated Mineral
Browse sedimentary or igneous associated mineral specimens identified by the Rock Identifier community.
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Quartz
Silicon dioxide (SiO2)
Mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Rhyolitic Matrix
igneous
Jasper with Agate Inclusions
Jasper (Silicon Dioxide, SiO2) with Chalcedony/Agate
sedimentary
Greenstone
Metabasalt / Greenschist
metamorphic
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Blue fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
White Buffalo Turquoise (or Howlite/Magnesite)
Calcite/Dolomite or Magnesite with Chert/Quartz inclusions
gemstone
Eudialyte in Matrix
Na15Ca6(Fe,Mn)3Zr3(Si,Nb) (Si25O73) (OH,Cl,H2O)3
mineral
Fluorite
Calcium Fluoride (CaF2)
Mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (mostly SiO2)
igneous
Pyrite (or Fool's Gold)
Pyrite (FeS₂)
Mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Granite Pegmatite
Pegmatite (Quartz, Feldspar, Mica)
igneous
Pink Granite / K-Feldspar
Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)
igneous
Sandstone (Greywacke)
Arenite / Clastic Sedimentary Rock
sedimentary
Black Obsidian (Faceted)
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Green Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Quartz with Metallic Inclusion
Silicon Dioxide (SiO2) with associated metallic sulfide or oxide
mineral
Dalmatian jasper
Orbicular rhyolite, commonly sold as Dalmatian jasper; quartz- and feldspar-rich volcanic rock with dark amphibole/biotite inclusions
igneous
Glauconitic Sandstone
Glauconitic Sandstone (complex silicate formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Milky Quartz
Quartz (SiO2)
mineral
Granodiorite
Granodiorite
igneous
Obsidian
Volcanic Glass (SiO2 + minor impurities)
igneous
Plum Blossom Tourmaline
Tourmaline with Lepidolite (Na,Ca)(Li,Mg,Al)3Al6(BO3)3Si6O18(OH)4
igneous
Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite
Limonite/goethite mixture (hydrated iron oxides), composition uncertain from image
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral