Red Sandstone or Brick Fragment
Arenite (if sandstone)
sedimentary
Category
Not A Natural Rock (Man Made Composite)
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Sandstone
Arenite
sedimentary
Carved Gemstone Mushroom
Quartz / Feldspar composite (Carved lapidary art)
gemstone
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Diamond
Diamond (pure Carbon, C)
mineral
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Bismuth
Bismuth (Bi)
mineral
Unakite
Epidotized Granite
metamorphic
Diamond
Carbon (C)
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Graphite
Graphite (Native Carbon, C)
metamorphic
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
mineral
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Unakite
Unakite (Epidotized Granite)
metamorphic
Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Polished brown jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
gemstone
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Sea Glass
Man-made silicate glass weathering product
sedimentary
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Diamond
Carbon (C)
gemstone
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Chert / River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic