Tumbled milky quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Category
Sedimentary Or Igneous Associated Mineral
Browse sedimentary or igneous associated mineral specimens identified by the Rock Identifier community.
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Banded tourmaline (likely schorl)
Black tourmaline, primarily schorl; complex borosilicate, commonly NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Chert Nodule (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
mineral
Greenschist / Greenstone
Greenschist facies metabasite
metamorphic
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor calcite or nepheline
mineral
Petrified Wood
Silicified wood (SiO2)
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Amazonite
Microcline feldspar, KAlSi₃O₈
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Common Opal (Potch)
Opal (Hydrated silica, SiO2·nH2O)
mineral
Tumbled howlite (probable)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Raw quartz specimen
Quartz (silicon dioxide, SiO₂), likely milky quartz
mineral
Chert (Vuggy Chert)
Silicon Dioxide (SiO2)
sedimentary
Tumbled Quartz (Snow Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled snowflake obsidian (probable)
Obsidian, volcanic glass (SiO₂-rich rhyolitic composition), with cristobalite or feldspar spherulites
igneous
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Vesicular basalt pebble
Basalt, commonly plagioclase + pyroxene ± olivine, with vesicles
igneous
Red Jasper (with Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Porphyritic Igneous Rock / Porphyry
Porphyry (Plagioclase/Quartz phenocrysts in a finer-grained groundmass)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic intrusive igneous rock (high Orthoclase Feldspar content)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Snowflake obsidian cabochon
Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification
igneous
Fossilized Shark Tooth (Basal Bone)
Otodus sp. (Mineralized Hydroxyapatite)
sedimentary
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Polished green fluorite tower
Fluorite (calcium fluoride, CaF₂)
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8
mineral
Pink Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary