Chert (specifically a stream-worn Chert Nodule)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral, Specifically A Variety Of Quartz
Browse mineral, specifically a variety of quartz specimens identified by the Rock Identifier community.
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Blue Agate
Chalcedony (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Amethyst Geode
Silicon Dioxide (SiO2) - Amethyst variety of Quartz
mineral
Chert (Common Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz (Aura Quartz)
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Labradorite (likely Black Labradorite or Larvikite)
Labradorite (Na,Ca)(Al,Si)4O8. If a rock, it is typically anorthosite, gabbro, or norite, or a variety of syenite called Larvikite if it is specifically from Larvik, Norway.
Mineral/Igneous Rock
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Black Onyx
Onyx (Silicon Dioxide, SiO2)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 + Manganese/Iron oxides)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with trace aluminum and irradiation
mineral
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded Agate (Yellow Agate)
Silicon Dioxide (SiO2)
mineral
Jasper (Chocolate or Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Amethyst (Quartz Variety)
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Aquamarine (Pale variety)
Beryl (Be3Al2Si6O18)
mineral
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variant
mineral
Orange Calcite (Banded Calcite)
Calcium Carbonate (CaCO3)
mineral
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Fe2+): Ca2MgAl2(Si2O7)(SiO4)(OH)2∙H2O)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral