Mica Schist
Mica Schist (primarily Muscovite or Biotite)
metamorphic
Category
Mineraloid
Browse mineraloid specimens identified by the Rock Identifier community.
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Gneiss
High-grade Metamorphic Gneiss
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Manganese Dendrite on Siltstone
Manganese Oxide (pyrolusite or psilomelane) Dendrites
mineral/sedimentary
Pyrite Sun (Pyrite Dollar)
Iron Disulfide (FeS2)
mineral
Granite
Granite (Phaneritic igneous rock)
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)
igneous
Red Granite
Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)
igneous
Red Granite
Phaneritic Plutonic Rock (High Potassium Feldspar)
igneous
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Dendritic Quartz
Silicon Dioxide (SiO2) with Manganese Oxide inclusions
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Desert Rose Fragment (Atypical) / Weathered Chert
Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy
sedimentary
Banded Gneiss
Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)
metamorphic
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Diorite
Diorite (an intermediate intrusive igneous rock)
igneous
Eclogite
Eclogite (Omphacite + Almandine-Pyrope Garnet)
metamorphic
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Gabbro
Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)
igneous
Prasiolite and Quartz Crystal Cluster
Quartz (SiO2); Prasiolite is a variety of Quartz
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Tiger's Eye (with Hematite/Jasper)
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)
mineralogical
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Porphyritic Rhyolite or Andesite (Porphyry)
Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)
igneous
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)
metamorphic
Dragon Blood Jasper
Quartz (SiO2) with Epidote and Piedmontite inclusions
sedimentary
Chert (Green River Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Greisen
Greisen
Metamorphic
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral
Chert (specifically Silex or Flint)
Microcrystalline Quartz (SiO2)
sedimentary