Anthropogenic (Man Made Product Subject To Geological Processes)

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Map Jasper (Grey Picasso Jasper)

Silicon Dioxide (SiO2) with impurities

Green Fluorite

Calcium Fluoride (CaF2)

Orange Calcite and White Calcite

Calcium Carbonate (CaCO3)

Olivine (Peridot)

Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Turquoise

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

Blue Calcite

Calcium Carbonate (CaCO3)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Greywacke

Dirty Sandstone (Lithic wacke)

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Quartz

Silicon Dioxide (SiO₂)

Bixbyite on Rhyolite

Bixbyite (Mn2+,Fe3+)2O3

Quartz on Chlorite Schist

Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Milky Quartz (or Iron-Stained Quartz)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Kambaba Jasper

Stromatolite / Fossilized Algae (Rhyolitic structure)

Quartzite

Quartzite (primarily SiO2)

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Limestone

Calcium Carbonate (CaCO3)

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Bog Iron / Limonite Concretion

Goethite/Limonite mixture (FeO(OH)·nH2O)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Biotite (Black Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Fluorite and Red Jasper

Fluorite (Calcium Fluoride, CaF2) and Red Jasper (Silicon Dioxide, SiO2)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Green Fluorite

Fluorite (Calcium Fluoride) - CaF2

Quartz Pebble

Silicon Dioxide (SiO2)

Rough Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Olivine (Peridot in gem form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Eclogite

Eclogite (comprising Omphacite and Garnet)

Chert (often called Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)