Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
sedimentary
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety with hematite or goethite inclusions) Chemical Formula: (Ca,Na)(Al,Si)2Si2O8
Mineral
Sunstone
Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Bauxite
Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))
sedimentary
Granite
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
Igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Basalt with Quartz/Calcite Inclusions
Mafic Volcanic Rock (Fe-Mg silicate rich)
igneous
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Sandstone (River Pebble)
Arenite
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock (Basalt)
igneous
Sandstone (Quartzite-rich River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
sedimentary
Granular Sandstone
Arenite (variable composition, primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Coarse-grained Quartz with Feldspar inclusions
Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions
igneous
Obsidian
Volcanic glass (SiO2 - Silicon dioxide predominant composition)
Igneous
Schist/Phyllite
Metamorphic Schist (Chlorite Schist variety)
metamorphic
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO₂)
metamorphic
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Gneiss
Gneiss
metamorphic
Basalt with Quartz/Calcite matrix
Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary