Quartz (Yellow/Milky variety)
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral
General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)
Anhydrite (Calcium Sulfate, CaSO4)
Mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Rose Quartz
Crystalline Silicon Dioxide with trace Titanium/Manganese/Iron (SiO2)
mineral
Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
sedimentary
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Garnet
Garnet Group (complex nesosilicates with general formula X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+, V3+)
Mineral
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Red/Brown Variety)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Mineral (variety of Chalcedony/Quartz)
Rose Quartz
Quartz (Silicon Dioxide, SiO2) with trace inclusions of dumortierite
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Chalcedony or River Jasper
Silicon Dioxide (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Orthoclase Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
Quartz (Milky or Grainy Variety)
Silicon Dioxide (SiO2)
mineral
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Obsidian
Obsidian (Volcanic Glass)
Igneous