Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Industrial Byproduct (Anthropogenic Material)
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Black Tourmaline (Schorl)
Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral/gemstone
Orange Quartz (or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Basalt (Vesicular)
Vesicular Basalt
igneous
Milky Quartz (Ferruginous)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Biotite Schist
Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Diamond
Carbon (C)
gemstone
Red Garnet Gemstone
Pyrope-Almandine Garnet (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
gemstone
Quartzite Pebble
Quartzite
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Sandstone
Arenite
sedimentary
Diamond
Carbon (C)
gemstone
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sulfur-bearing Limestone (Solfatara Specimen)
Sulfur-rich Bio-limestone (Calcium Carbonate with Native Sulfur, S8)
sedimentary
Quartz Nut
SiO2 (Silicon Dioxide)
mineral health
Coral Fossil
Anthozoa (Scleractinia)
fossil
Quartzite (Milky or Cloudy Quartz variant)
Silicon Dioxide (SiO2)
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Iron Oxide)
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite
metamorphic
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble (Water-Worn)
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Chert (var. Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Arsenopyrite in Quartz/Host Rock
Arsenopyrite (FeAsS)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Sandstone (Quartz Arenite)
Clastic Sedimentary Rock - Quartz Arenite
sedimentary
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Quartzite with inclusions
Quartzite (SiO2)
metamorphic
Bumblebee Jasper
Fibrous Calcite with Arsenic and Sulfur inclusions
mineral