Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
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Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Tumbled amber
Amber (fossilized plant resin), chiefly polymerized diterpenoid resin
gemstone
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Diamond
Carbon (C)
mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Tumbled amber
Amber (fossilized plant resin; commonly succinite, C10H16O)
gemstone
Amber
Succinite (C10H16O)
gemstone
Diabase (Dolerite)
Diabase / Dolerite
igneous
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Amber
Succinite (Formula: C10H16O)
Mineraloid
Diamond
Cubic carbon (C)
mineral
Sandstone
Arenite
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Chert
Chert (microcrystalline quartz)
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Granite Cobble/Pebble
Granite
Igneous
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Abbey Bominable (Monster High character)
Anthropomorphic Yeti / Digital Animation
not a rock (animated character)
Coquina
Biogenic Limestone (Coquina)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic