Mineral Description (Anthropogenic Material)

Labradorite

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Likely botryoidal malachite or chrysocolla specimen

Malachite, Cu₂CO₃(OH)₂; possibly chrysocolla, hydrated copper silicate

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Fuchsite

Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Labradorite

Labradorite (Plagioclase Feldspar), (Ca,Na)(Al,Si)4O8

Quartz Pebble

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartz (Microcrystalline variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Muscovite (White Mica)

Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2

White Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Moss Agate / Carnelian Agate

Silicon Dioxide (SiO2) with iron and manganese inclusions

Marble

Recrystallized Carbonate Rock (CaCO3)

Sandstone

Arenite (SiO2 based)

Raw gold nugget or gold-bearing quartz

Native gold (Au), possibly with quartz (SiO₂) and iron-oxide staining

Quartz-bearing altered rock, possibly iron-stained quartz vein

Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining

Porphyry

Porphyritic Andesite / Basaltic Porphyry

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Gneiss

Gneiss

Siltstone

Siltstone

Siltstone

Siltstone (primarily composed of quartz and clay minerals)

Siltstone with Weathering Rind

Siltstone (composed of microscopic quartz and clay minerals)

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Rose Quartz

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

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Iron Ore (Hematite/Goethite)

Ironstone (Fe2O3 / FeO(OH))

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Zebra Marble

Metamorphosed Limestone (Recrystallized Calcite)

Mixed Polished Gemstones (Tumbled Stones)

Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Brown chalcedony (likely carnelian/iron-stained quartz)

Microcrystalline quartz, SiO₂; brown coloration from iron oxides/hydroxides

Likely anthracite coal

Anthracite; predominantly carbon (C), with minor mineral impurities

Citrine Quartz

Silicon Dioxide (SiO2)

Copper ore with native copper and quartz/calcite

Malachite–chrysocolla–cuprite-bearing copper ore, likely with quartz or calcite gangue

Bronzite

(Mg,Fe)SiO3

Lepidolite (in Quartz Matrix)

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]