Aventurine
Quartz (Aventurine variety)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Aventurine
Quartz (Aventurine variety)
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sandstone
Arenite (primarily composed of SiO2)
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
Sandstone
Arenite (SiO2 primarily)
Red Jasper
Silicon dioxide (SiO2) with iron inclusions
Gold
Native Gold (Au)
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Geode (unopened)
Silica-filled Concretion (SiO2)
Gneiss
Gneiss
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Sandstone
Arenite (predominantly Quartz Sandstone)
Chert (Red/Brown Variety)
Microcrystalline quartz (SiO2)
Chert (Jasper)
Microcrystalline Quartz (SiO2)
Basalt with Quartz Veins
Basalt (SiO2 range 45-52%)
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
Chert (variations include Flint or Jasper)
Chert (chemical sedimentary rock), Quartz (SiO2)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Formation
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Ferruginous Sandstone
Arenite with Iron-oxide cement
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (Sandstone)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Quartz Geode
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Sandstone (Pebble)
Arenite / Clastic Sedimentary Rock
Emerald In Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Milky Quartz
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium or Manganese
Sandstone
Arenite (primarily SiO2)
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)