White Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Category
Sedimentary Or Igneous Fragment
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone (often misnamed Dalmatian Jasper)
Aplite (with hornblende/arfvedsonite inclusions)
igneous
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chert (specifically Flint or Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz, Chalcedony, or Opal)
sedimentary
Clear Quartz (Rock Crystal Fragments)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate
Sedimentary
Black Onyx
Silicon Dioxide (SiO2) with parallel banding
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Fluorite (Purple Octahedron)
Calcium Fluoride (CaF2)
Mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)
mineral
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)
sedimentary
Dalmatian Stone (Dalmatian Jasper)
Dalmatian Stone (A variety of Perthite / Aplite)
Igneous
Sandstone Beach Pebble
Clastic Sandstone (SiO2 - Quartz-dominant)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sapphire
Corundum (Al2O3)
mineral
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Star Ruby
Corundum (Al2O3 with chromium and rutile inclusions)
mineral
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)
sedimentary
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
Conglomerate
Conglomeratic Sandstone / Polymictic Conglomerate
sedimentary
Conglomerate
Conglomerate (lithified rudite)
sedimentary
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Dalmatian Stone
Peralkaline rhyolite
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Red Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral