Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
mineral/hydrothermal
Category
The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).
Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite with Calcite
Iron Disulfide (FeS2) with Calcium Carbonate (CaCO3)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Siltstone or Mudstone
Argillaceous sedimentary rock
sedimentary
Chalcedony (Agate/Carnelian)
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Basalt with Quartz/Quartzite Veins
Aphanitic Mafic Volcanic Rock with Siliceous Infillings
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Ferruginous variety)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6
mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Fossiliferous Limestone (with Oyster Fossils)
Fossiliferous Calcarenite / Bivalve Mollusk Fossil
sedimentary
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Weathered Quartzite or Chert Pebble
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary