Greenstone
Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)
metamorphic
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Schist
Mica Schist
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Red Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
River Cobble (likely Basalt or Metagraywacke)
Non-specific water-worn lithic fragment
igneous or metamorphic
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Greywacke
Greywacke sandstone
sedimentary
Greywacke
Lithic wacke (variety of Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone Pebble (Quartzite-rich)
Clastic Terrigenous Sedimentary Rock (SiO2 dominant)
sedimentary
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
sedimentary
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Gold Ore
Auriferous Quartz and Sulfide Mineralization in Host Rock
igneous
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Basalt
Mafic Extrusive Igneous Rock
Igneous
Red Sandstone
Arenite with Hematite cementation
sedimentary
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Tiger's Eye
Tiger's Eye (a variety of Quartz, SiO₂)
Mineral (specifically a gemstone variety)
Obsidian
Obsidian (Volcanic Glass)
igneous
Ferruginous Sandstone (Gritstone)
Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)
sedimentary
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Schist
Mica Schist
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chalcedony in Host Rock
Chalcedony (SiO2)
mineral
Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic