Mineral (Man Enhanced)

Spessartine Garnet

Manganese aluminum silicate (Mn2+3Al2(SiO4)3)

Green Chalcedony (Batu Akik)

Silicon Dioxide (SiO2)

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Blue Dyed Quartzite

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate Slice

Microcrystalline Quartz (SiO2) with artificial pigment

Chert

Microcrystalline Quartz (SiO2)

Slag

Metallurgical Slag

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Polished blue agate/geode slice

Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue

Purple chalcedony / agate

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony with possible amethystine coloration

Tumbled blue-green stone, likely turquoise or chrysocolla

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper silicate

Carnelian

Carnelian (Silicon Dioxide - SiO2 with Hematite impurities)

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline quartz (SiO₂)

Mohave Turquoise (Composite/Stabilized)

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

Rough Diamond

Native Carbon (C)

Diamond (in a cluster setting)

Crystallized Carbon (C)

Sandstone Concretion

Clastic Sedimentary Concretion (SiO2 with Iron Oxide)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Green Calcite

Calcium Carbonate (CaCO3)

Sandstone Concretion

Sedimentary Clastic Rock (Silicate-rich)

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Unidentifiable Rock Fragment

Peacock ore

Iridescent chalcopyrite, commonly bornite-coated or artificially treated copper sulfide

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Likely tumbled red mineral or glass imitation

Indeterminate; possibilities include red jasper (microcrystalline quartz, SiO₂) or dyed chalcedony

Opalite

Synthetic Glass (SiO2 + impurities)

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Hematite bead bracelet

Hematite (Fe₂O₃), likely polished or magnetically enhanced beads

Opalite-style glass pendant

Man-made opalescent glass (not natural opal)

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Chevron Amethyst

Silicon Dioxide (Quartz variety) - SiO2

Purple Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)