Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Category
Mineral In Igneous Rock
Browse mineral in igneous rock specimens identified by the Rock Identifier community.
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Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Basalt
Mafic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
River Rock with Quartz Vein
Basalt or Andesite with Quartz Veining
igneous
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Granite fragment
Granite (Felsic Plutonic Rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Peridotite
Ultramafic intrusive igneous rock
igneous
Small weathered mineral/rock fragment
Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock
mineral
Pegmatite with Quartz and Feldspar
Intrusive Igneous Rock
igneous
Uncertain small stone; possibly weathered quartz-bearing rock
Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock
mineral
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
igneous
Greenstone pebble
Likely chlorite- and/or actinolite-bearing metamorphic rock; exact composition cannot be determined from the image.
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Likely magnetite-bearing rock
Magnetite (Fe₃O₄), possibly in a mafic host rock
igneous
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Granite
Granite
Igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
igneous
Blue-gray stone pebble (possibly slag or a weathered rock)
Unidentified fine-grained rock; composition cannot be determined from the image
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Foliated metamorphic rock, likely mica schist
Mica schist, mainly quartz–feldspar–mica assemblage
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
mineral
Small dark, speckled stone (likely granite or diorite)
Likely fine-grained granitoid; exact identification is uncertain from the small, blurry view
igneous
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Amygdaloidal Basalt
Extrusive Igneous Rock with Secondary Mineral Fillings
igneous
Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Granite
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Granite Pebble
Granite
igneous
Rough amber-colored quartz or calcite fragment
Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing
mineral
Unidentified small mineral fragments
Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image
mineral
Granite Pebble
Granitoid (Plagioclase, Alkali feldspar, Quartz, Biotite/Amphibole)
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous