Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Category
Mineral, Often Found As Detrital Grains In Sedimentary Rocks
Browse mineral, often found as detrital grains in sedimentary rocks specimens identified by the Rock Identifier community.
Sandstone concretion (Ironstone-stained)
Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (Chemical formula: primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
Mica Schist
Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)
metamorphic
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite
sedimentary
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Shale
Shale
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Gneiss (Metamorphic Cobble)
Gneiss
metamorphic
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Sandstone Concretion
Moqui Marble (Iron-oxide concretion)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
mineral
Gneiss
Gneiss
metamorphic
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Ironstone Concretion
Siderite or Ferruginous Concretion (FeCO3 or Iron Oxides)
sedimentary
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Schist (Micaceous Schist)
Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)
metamorphic
Arkosic Sandstone
Arkose (Clastic Sedimentary Rock)
sedimentary
Siltstone
Siltstone (primarily SiO2 with Al2O3 and Fe2O3)
sedimentary
Quartz (Milky Quartz / Greenish Quartz)
SiO2 (Silicon Dioxide)
mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral