Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)
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Quartz (Clear Quartz / Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Jasper and Basalt (Mixed Breccia or Chert)
Silicon Dioxide (SiO2) with Ferromagnesian silicates
sedimentary and igneous (mixed)
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Massive White Quartz
Silicon Dioxide (SiO2)
mineral
Jasper-Quartz Conglomerate / Chert
Siliceous Sedimentary Rock (SiO2)
sedimentary
Magnetite / Hematite (Iron Ore)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Tumbled pink granite or feldspar-rich pebble
Granite; chiefly quartz (SiO₂), feldspar, and minor mica, though the specimen may be pink orthoclase feldspar
igneous
Conglomeratic volcanic breccia
Lithic volcanic breccia, likely andesitic or basaltic
igneous
Granite Pebble
Granite
igneous
Gabbro
Gabbro
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Sandstone (likely Greywacke or Siltstone variety)
Arenite / Siltstone (primarily SiO2)
sedimentary
Exposed granitic bedrock
Granite, likely a foliated or weathered granitoid (quartz–feldspar–mica assemblage)
igneous
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
metamorphic
White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Ferruginous variety)
Silicon Dioxide (SiO2)
mineral
Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Mixed River Stones and Agates
Mixed Silicates and Ironstones (primarily SiO2 and Fe2O3)
sedimentary
Smoky Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Mixed polished river pebbles, predominantly quartzite and quartz
Quartzite (SiO₂), quartz (SiO₂), with possible feldspar-rich and iron-stained lithologies
metamorphic
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Mixed Mineral Collection (with Quartz, Beryl, and host rock)
Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Weathered granitic rock fragment
Likely granite or granodiorite; quartz–feldspar–mica aggregate
igneous