Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Cloudy Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite (Sugar Quartz)
Quartzite (primarily SiO2)
metamorphic
Fluorite (likely Green Fluorite variant)
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Quartz
Quartz (Silicon Dioxide) with Iron Inclusion (SiO2 + Fe2O3)
mineral
Aragonite (Yellow/Honey Tumble)
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite
sedimentary
Chert (often called Flint in this variation)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Fluorite (Rainbow/Purple Fluorite)
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Dumortierite Quartz (Blue Quartz)
Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (predominantly SiO2, approximately 70% or more)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Chert (Chalk-associated Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chert (specifically Tan/Brown Chert)
Chert (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Plagioclase Feldspar (specifically Albite/Oligoclase)
(Na,Ca)(Si,Al)4O8
mineral
Psilomelane (Black Hematite/Manganese Ore)
Barium Manganese Oxide (Formula: BaMn9O18(OH)4)
mineral
Sandstone
Arenite
sedimentary
Iron-Stained Quartzite
Recrystallized Meta-Quartzite (primarily SiO2)
metamorphic