Quartz
Silicon Dioxide (SiO2)
Mineral
Category
Mineral (Man Enhanced)
Browse mineral (man enhanced) specimens identified by the Rock Identifier community.
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Wonderstone (Sandstone)
Silicified Quartz Sandstone with Iron Oxide staining
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gneiss
Gneissic Metamorphic Rock
metamorphic
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Conglomerate
Conglomerate
Sedimentary Rock
Obsidian with Spherulitic Devitrification (Snowflake Obsidian/Mahogany related)
Volcanic Glass (70% or more SiO2)
igneous
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert Pebble (Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Greywacke (River Slikkenstone)
Greywacke (Impure Sandstone)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a plutonic igneous rock)
Igneous
Prase Quartz on Feldspar
Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)
mineral
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Quartz
Silicon Dioxide (SiO2)
Mineral
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic