Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Red Sandstone
Arenite (Iron-rich)
sedimentary
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Turquoise cabochon
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Chert (Banded)
Microcrystalline Quartz (SiO2)
sedimentary
Tourmalinated quartz sphere
Quartz (SiO₂) with black schorl tourmaline inclusions
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Tumbled cream chalcedony or quartz
Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony
mineral
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Tumbled blue chalcedony (likely blue quartz/chalcedony)
Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
sedimentary
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Mixed Gemstone Beaded Jewelry
Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)
Mineral
Granite pebble
Granite, chiefly quartz, feldspar, and mica
igneous
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Dyed Agate Geode Slice
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Sandstone
Sandstone (SiO2 dominant, with minor feldspar and clay minerals)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Chert (Yellow Jasper)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone Pebble (River Rock)
Sandstone (Quartz-rich sedimentary rock with iron oxide staining)
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Sandstone
Arenite
Sedimentary
Tektite (likely indochinite)
Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium
mineral