Mineral, Sediment

Malachite

Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)

Granite

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

Banded Gneiss

Gneiss

Granite

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

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Peach Aventurine

Silicon Dioxide (SiO2) with inclusions

Quartz (Milk Quartz Cobble)

Silicon Dioxide (SiO2)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Basalt Porphyry

Porphyritic Basalt

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Rutilated Quartz (with Garnet pendant)

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Arfvedsonite (often mistakenly sold as Astrophyllite)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Sandstone (Quartzose Sandstone)

Arenite

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite and Calcite inclusions

Quartz Druzy on Matrix (likely Agate or Jasper)

Silicon Dioxide (SiO2) with various mineral inclusions

Quartz with Inclusions

Silicon Dioxide (SiO2) with various mineral inclusions

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Graphite

Graphite (Native Carbon, C)

Quartz Pebble

Silicon Dioxide (SiO2)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Chlorite (Small Flakes/Sand)

Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Sandstone (Pebble)

Arenite (primarily SiO2)

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Blue Kyanite

Kyanite (Al2SiO5)

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Gneiss (Metamorphic Cobble)

Gneiss

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Turquoise

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

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Magnetite

Magnetite (Iron(II,III) oxide, Fe3O4)