Not A Rock (Synthetic Material)

Quartz (in a rock matrix)

Quartz (SiO2)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Granite

Granite (Felsic intrusive igneous rock)

Granite

Granite (a common type of Felsic Intrusive Igneous Rock)

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Iron Slag

Ferrous Slag (complex silicate and oxide byproduct)

K2 Azurite Granite / K2 Stone

Granite (igneous rock) with Azurite inclusions (mineral)

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Granite (Pink/Red variety)

Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Cockle Shell (Fossil or Recent)

Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)

Slag (Industrial Glassy Byproduct)

Anthropogenic silicate byproduct (Slag)

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Granite

Granite (a plutonic igneous rock)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Mica Schist

Mica Schist (predominantly composed of Muscovite or Biotite silicates)

Mookaite Jasper

Siliceous (chert) sedimentary rock, a form of Jasper

Red Jasper

Jasper (a variety of Quartz, SiO2)

Basalt

Basalt

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Quartz (in matrix)

Quartz (SiO₂)

Shale

Shale (fine-grained clastic sedimentary rock)

Slag Glass

Amorphous Silica / Glass Slag

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Granite

Granite (a felsic intrusive igneous rock)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Ironstone Concretion / Limonite Node

Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)