Mineral Description (Anthropogenic Material)

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Laterite

Laterite (Ferricrete / Alcrete)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Petrified Wood

Silicified Wood (primarily SiO2)

Diorite

Diorite

Likely weathered quartz-bearing rock fragment

Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite

Greenstone Pebble

Metabasalt / Greenschist

Tumbled blue glassy mineral, possibly sodalite or blue aventurine

Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material

Chondrite Meteorite

Ordinary Chondrite (Undifferentiated Meteorite)

Tumbled green-and-white stone, likely serpentine

Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc

Sandstone (Yellow/Siltstone variant)

Arenite (SiO2 primarily)

Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite

Quartz (SiO₂), potentially with feldspar and iron-oxide staining

Yellow Diamond (Faceted)

Diamond (pure carbon) with nitrogen impurities, C

Diamond (Faceted)

Carbon (C)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Banded Calcite (often sold as 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Sandstone

Arenite (clastic sedimentary rock)

Red Sandstone

Arenite

Sandstone

Arenite (often composed of Quartz, SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Sandstone

Sandstone (composed mainly of Quartz, SiO2, and Feldspar)

Sandstone

Arenite (composed primarily of SiO2)

Yellow chalcedony (likely heat-treated or resin-coated)

Microcrystalline quartz, SiO₂

Rough Diamond

Carbon (C)

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nHeO)

Pyrite

Iron Sulfide (FeS2)

Banded metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests

Pyrite (on host rock)

Iron Sulfide (FeS2)

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Yellow-brown quartz/chalcedony fragment

Quartz, SiO₂; likely microcrystalline chalcedony with iron-oxide staining

Serpentinite

Serpentinite (Hydrated magnesium iron phyllosilicate)

Amethyst cluster

Amethyst, purple quartz (SiO₂)

Rose quartz heart

Quartz, silicon dioxide (SiO₂), pink variety

Mohave Turquoise (Composite/Stabilized)

Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions

Uraninite (Pitchblende)

Uranium dioxide (UO2)