Milk Quartz (with Iron staining)
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock (Man Made Industrial Metal)
Browse not a rock (man made industrial metal) specimens identified by the Rock Identifier community.
Granite (Phaneritic Igneous Rock)
Granite
igneous
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Diamond (in Matrix)
Carbon (C)
mineral
Basalt
Basalt
igneous
Dyed Blue Agate
Silicon Dioxide (SiO2)
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert
Chert (microcrystalline quartz)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Basalt (Water-worn Pebble)
Basalt (Mafic volcanic rock)
Igneous
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Basalt
Basalt (composition of Plagioclase feldspar and Pyroxene)
igneous
Basalt
Basalt
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Rose Quartz (or Quartzite)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Limonitic Quartzite
Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Peridot in Basalt
Olivine ((Mg, Fe)2SiO4) in Basalt
mineral
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
igneous
Scoria (Red Lava Rock)
Scoria
igneous
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral