Man Made Object (Metalwork)

Weathered limestone pebble

Limestone, chiefly calcite (CaCO₃)

Petrified Wood

Silicified wood (primarily SiO2)

Diamond (in jewelry setting)

Diamond (C - Carbon)

Polished mahogany obsidian

Volcanic glass (mostly SiO₂), commonly called mahogany obsidian

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Colorless faceted gemstone, likely glass or quartz

Uncertain; appearance is consistent with faceted quartz (SiO₂), but cut glass or cubic zirconia cannot be excluded from the photograph

Polished rose quartz bowl

Quartz, silicon dioxide (SiO₂), likely rose quartz

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color commonly from iron impurities or irradiation

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)

Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating

Likely tumbled amethyst

Amethyst, purple quartz (SiO₂)

Likely yellow quartz gemstone ring

Quartz (SiO₂), possibly heat-treated citrine or lemon quartz; metal setting appears to be brass/gold-colored alloy

Granite with a polished dark-red granite cobble

Granite; predominantly quartz, feldspar, and mica

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Obsidian Arrowhead Replica (or similar knapped stone)

Obsidian (volcanic glass) or Chert

Possible iron-nickel meteorite

Unclassified suspected meteorite; composition and origin cannot be confirmed from the image

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Polished orbicular jasper (likely leopard-skin or brecciated jasper)

Microcrystalline quartz (SiO₂) with iron-oxide minerals; exact variety uncertain from the image

Iron meteorite fragment

Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Larimar

Pectolite

Dark glassy pebble, possibly volcanic rock

Likely basalt or volcanic glass (var. obsidian), unconfirmed from image

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Petrified Wood

Silicified Wood (SiO2)

Unidentified small mineral fragment

Possibly quartz or feldspar-bearing rock; exact identification is uncertain from the image

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Diamond

Carbon (C)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)

Concretion or weathered iron-rich rock

Likely limonite/goethite-rich concretion; exact identification requires testing

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Possible iron meteorite fragment

Iron meteorite, likely kamacite–taenite alloy

Diamond

Native Carbon (C)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Diamond (in a jewelry setting)

Carbon (C)

Likely faceted colorless gemstone

Probable quartz (rock crystal), SiO₂; diamond or topaz cannot be excluded from the photograph

White chalcedony cabochon ring

Chalcedony (microcrystalline quartz, SiO₂), likely white quartz variety

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Carved stone bowl or mortar

Uncertain; likely steatite (soapstone) or fine-grained volcanic stone

Likely fossilized shell or carbonate concretion

Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)

Tumbled quartz pebble, likely iron-stained quartz

Quartz (silicon dioxide, SiO₂), possibly milky quartz with limonite/goethite staining

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)