Man Made Object (Coin)

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Obsidian (likely snowflake or banded variety)

Volcanic glass, primarily SiO₂

Likely tumbled amethyst

Amethyst, purple quartz (SiO₂)

Sand Dollar (Fossilized or Calcium Carbonate Skeleton)

Clypeasteroida (Order)

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

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

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

Obsidian Arrowhead Replica (or similar knapped stone)

Obsidian (volcanic glass) or Chert

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

Unidentified rough rock fragment

Undetermined; the image does not show enough diagnostic detail for a reliable rock identification

Possible iron-nickel meteorite

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

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Orange Calcite (or Yellow Calcite)

Calcium Carbonate (CaCO3)

Larimar

Pectolite

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Petrified Wood

Silicified Wood (SiO2)

Dark glassy pebble, possibly volcanic rock

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

Selenite (satin spar gypsum)

Gypsum, CaSO₄·2H₂O; fibrous variety known as satin spar

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

Green Calcite

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Green Calcite

Calcium Carbonate (CaCO3)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Orange Calcite

Calcium Carbonate (CaCO3)

Fluorite

Calcium Fluoride (CaF2)

Caribbean Calcite

Calcite and Aragonite (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

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

Unidentified small mineral fragment

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

Marble

Recrystallized Calcite (CaCO3)