Heart-shaped Pebble (Limestone/Quartz)
Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Object (Simulant)
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Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Unable to Identify (Image Obscured)
Indeterminate
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation
gemstone
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Weathered limestone pebble
Limestone, chiefly calcite (CaCO₃)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Hematite
Iron(III) oxide (Fe2O3)
mineral
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Obsidian Arrowhead Replica (or similar knapped stone)
Obsidian (volcanic glass) or Chert
igneous
Vesicular Basalt (Scoria)
Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)
Igneous
Dark glassy pebble, possibly volcanic rock
Likely basalt or volcanic glass (var. obsidian), unconfirmed from image
igneous
Likely fossilized shell or carbonate concretion
Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)
fossil
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Sedimentary
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond (or Diamond Simulant/Cubic Zirconia)
Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Iron meteorite fragment
Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment
meteorite
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Granodiorite
Granodiorite
Igneous
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (zirconium dioxide, ZrO₂); visual confirmation is unavailable
gemstone
Diamond (Set in jewelry)
Cubic Carbon (C)
mineral
Chelyabinsk Meteorite
Ordinary chondrite (LL5)
meteorite
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Orange Calcite
Calcite (CaCO3)
Mineral
Diamond (in jewelry)
Carbon (C)
mineral
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral