Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
Category
Browse mineral, specifically a variety of quartz specimens identified by the Rock Identifier community.
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
Banded Agate / Chalcedony
Silicon Dioxide (SiO2) with trace impurities
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
Granite
Granite (Phaneritic Acidic Igneous Rock)
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
Basalt
Mafic volcanic rock (Basalt)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
Quartz (Milky or Common variety)
Silicon Dioxide (SiO2)
Blue Lace Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Amazonite
K(AlSi3O8) - Microcline (Var. Amazonite)
Shungite
Shungite (carbon-rich Precambrian mineraloid)
Jasper Conglomerate (specifically Puddingstone)
Jasper Conglomerate (Siliceous sedimentary rock)
Greenschist
Greenschist (Chlorite-actinolite schist)
Agate
Chalcedony (cryptocrystalline variety of Quartz, SiO2)
Agate (Slab)
Agate (Cryptocrystalline variety of Quartz, SiO2)
Chalcedony
Chalcedony (a microcrystalline variety of Quartz, SiO2)
Amethyst
Quartz variety; SiO2 (Silicon Dioxide)
Banded Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
Dzi Bead (Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
Blue Dyed Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
Green Banded Agate
Agate (Variety of Chalcedony/Quartz), SiO2
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Banded Agate (Lace Agate)
Agate (Variety of Cryptocrystalline Quartz), SiO2
Blue Lace Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
Chert (specifically a Worked Flint/Knapped Flake)
Chert / Flint (Microcrystalline Quartz, SiO2)
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide with traces of titanium, iron, or manganese (SiO2)
Rose Quartz
SiO2 (Silicon Dioxide with trace amounts of iron, manganese, or titanium)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Blue Aventurine
Quartzite with Dumortierite inclusions (SiO2)
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Red Jasper
Silicon Dioxide (SiO2) - variety Jasper
Banded Agate
Silicon Dioxide (SiO2) - variety Chalcedony
Schist
Schist (various mineral compositions)
Banded Agate (Chert/Chaldcedony)
Silicon Dioxide (SiO₂)
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
Chert / Flint
Microcrystalline Quartz (SiO2)