Obsidian with Cristobalite
Volcanic Glass (Amorphous Silicon Dioxide) with Cristobalite inclusions
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Obsidian with Cristobalite
Volcanic Glass (Amorphous Silicon Dioxide) with Cristobalite inclusions
Dalmation Stone
Dalmation Jasper (Igneous microcrystalline quartz with arfvedsonite)
Granite Pebble
Granite (Plutonic Igneous Rock)
Porphyritic Basalt
Basalt (Extrusive Igneous Rock)
Granite
Intrusive Igneous Rock (Felsic)
Granite Pebble
Granite (Plutonic Igneous Rock)
Granite
Felsic intrusive igneous rock
Granite
Phaneritic Felsic Igneous Rock
Dragonstone (Brecciated Basalt/Diabase with Epidote and Quartz)
Brecciated mafic igneous rock
Granite Cobble
Phaneritic Felsic Igneous Rock
Granite
Phaneritic Felsic Igneous Rock
Granite (Fine-grained)
Phaneritic Felsic Igneous Rock
Clear Quartz
Silicon Dioxide (SiO2)
Granite
Phaneritic Felsic Intrusive Igneous Rock
Granite
Felsic intrusive igneous rock
Basalt with Amygdules
Extrusive Igneous Rock (Mafic)
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
Granite
Felsic intrusive igneous rock
Pumice
Pumice (volcanic rock)
Amygdaloidal Basalt
Extrusive Igneous Rock with Amygdules
Granite
Phaneritic Felsic Igneous Rock
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
Granite
Granite (Felsic Plutonic Rock)
Granite
Granite (Phaneritic igneous rock)
Porphyritic Igneous Rock / Granite or Rhyolite Porphyry
Porphyritic intrusive/extrusive igneous rock
Granite
Felsic intrusive igneous rock
Gabbro
Gabbro
Basalt
Mafic Igneous Rock
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
Likely quartz-bearing rock or mineral fragment
Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix
Granite
Granite; chiefly quartz, feldspar, and mica
Weathered granite fragment
Granite, primarily quartz, feldspar, and mica
Uncertain small tan mineral/rock fragment
Indeterminate from image; possibly feldspar-rich rock or calcite
Diorite
Intermediate plutonic igneous rock
Granite
Intrusive Felsic Igneous Rock
Diorite
Intermediate Phaneritic Igneous Rock
Granite
Felsic intrusive igneous rock
Granite Cobble
Plutonic Igneous Rock (Granitic)
Biotite Granite
Phaneritic Felsic Igneous Rock
Granite
Granite (a common igneous rock)
Granite
Felsic intrusive igneous rock
Granite
Granite (Plutonic Igneous Rock)