Not A Rock (Synthetic Material)

Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.

Quartz Geode/Druzy Quartz

Quartz (SiO₂)

Mineral

Quartz (milky quartz variety)

Quartz (SiO₂)

Mineral

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

sedimentary

Glazed Ceramic Tile

Fused Silicate-Clay composite

Synthetic (Man-made material mimicking natural stone)

Marble

Metamorphosed Limestone/Dolomite

metamorphic

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Sedimentary Rock

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Mineral

Quartzite

Quartzite (primarily SiO2)

metamorphic

Citrine Quartz

Citrine (Silicon Dioxide - SiO2)

Mineral

Quartzite

Metamorphic rock

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Mineral

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Mineral

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

mineral

Quartz

Quartz (SiO₂)

Mineral

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Mineral

Fuchsite Quartzite

Fuchsite-bearing Quartzite

Metamorphic

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Mineral

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral

Greisen

Metamorphic

Lapis Lazuli

Complex metamorphic rock consisting mainly of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite

metamorphic

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

sedimentary

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Mineral

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

mineraloid

Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

not a rock or mineral (anthropogenic material)

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Man-made Material / Glass

Chert or Flint (polished/water-worn)

Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.

Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral, often found as detrital grains in sedimentary rocks

Quartz

Silicon Dioxide (SiO2)

Mineral

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Mineral

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Igneous

Northern Shoveler Duck (Note: This is a biological specimen, not a rock)

Spatula clypeata

not a rock (biological/ornithological)

Amethyst Geode/Cluster

Quartz (SiO2) - variety Amethyst

Mineral

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Mineral, specifically a Cryptocrystalline Quartz variety

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Man-made Material (jewelry, metal alloy)