Sedimentary (Processed Mineral Product)

Kyanite

Kyanite (Al2SiO5)

Limonite (Iron-rich Gossan/Laterite)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Dyed turquoise-colored lava stone beads

Vesicular basalt (scoria), commonly sold as dyed lava rock

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Granite countertop with a small pale mineral fragment

Granite; predominantly quartz, feldspar, and mica

Turquoise and Hematite

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3

Green aventurine bead bracelet

Quartz (SiO₂), likely fuchsite-bearing aventurine

Black tumbled stone, likely obsidian

Volcanic glass; chiefly amorphous SiO₂

Limestone

Calcium Carbonate (CaCO3)

Tumbled pale green aventurine or chalcedony

Quartz-group silica, primarily microcrystalline SiO₂; possible fuchsite-bearing aventurine

Iron-stained chert or siliceous sedimentary rock

Microcrystalline quartz (SiO₂), likely chert with iron-oxide staining

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Quartzite

Quartzite (primarily SiO2)

Blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Honey calcite

Calcite (calcium carbonate, CaCO₃)

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

Blue Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Stichtite (often found in Serpentinite)

Stichtite Mg6Cr2CO3(OH)16·4H2O

Polished garnet beads

Garnet group, commonly almandine–pyrope solid solution (approximately Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃)

Polished white calcite sphere (identification tentative)

Calcite, CaCO₃

Native copper

Copper (Cu), often with malachite, cuprite, or matrix minerals

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Wollastonite

Calcium Inosilicate, CaSiO3

Amethyst (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Mica Schist with Quartz

Mica Schist (KAl2(AlSi3O10)(OH)2 / SiO2)

Common Gravel / Pebble

Lithified rock fragment / Detrital sediment

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Iron Slag (Industrial Byproduct)

Anthropogenic pyrometallurgical residue

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled and polished quartz crystal points

Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties

Milky quartz

Quartz (silicon dioxide, SiO₂)

Blue Apatite

Calcium phosphate fluoride, Ca5(PO4)3(F,Cl,OH)

Limestone

Calcium Carbonate (CaCO3)

Granite

Intrusive Igneous Rock

Blue tumbled stone, possibly sodalite

Likely sodalite (Na₈(Al₆Si₆O₂₄)Cl₂); identification is uncertain from the image

Tumbled milky quartz

Quartz (SiO₂), microcrystalline or massive variety

Pyrite specimen

Pyrite, FeS₂ (iron disulfide)

Iron-rich laterite (probable)

Laterite; iron oxides/hydroxides, commonly goethite and hematite mixed with clay minerals

Likely botryoidal calcite or aragonite specimen

Calcite (CaCO₃), possibly aragonite (CaCO₃)

Brown iron-rich rock, likely limonite/goethite-bearing stone

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite)

Iron-rich weathered pebble (likely limonite/goethite-bearing rock)

Limonite mixture, commonly dominated by goethite (FeO(OH)) and hematite (Fe₂O₃)