Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Category
Man Made Object (Coin)
Browse man made object (coin) specimens identified by the Rock Identifier community.
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Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Mixed small pebbles and mineral grains
Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments
sedimentary
Rounded quartz pebble (tentative)
Quartz, silicon dioxide (SiO₂)
mineral
Flint/chert projectile point
Microcrystalline quartz (SiO₂), archaeologically worked into a bifacial point
sedimentary
Fossilized shell fragment, likely bivalve
Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material
fossil
Green cabochon gemstone, likely glass-filled or synthetic emerald imitation
Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass
gemstone
Standing Liberty Quarter (Silver Specimen)
Native Silver alloy (Ag with Cu traces)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Diamond
Carbon (C)
mineral
Banded Calcite (Onyx Marble / Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Calcite rosette (possibly fossilized shell fragment)
Calcite, CaCO₃; crystal habit appears botryoidal/rosette-like
mineral
Tumbled cream-colored stone, likely calcite or marble
Calcite (CaCO₃), possibly recrystallized as marble
mineral
Crinoid Stem Fossil in Limestone
Crinoidea (class) in Calcium Carbonate (CaCO3) matrix
fossil
Fuchsite (Green Muscovite)
Fuchsite (Chromium-rich Muscovite), K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Amethyst and Calcite collection
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
mineral
Limestone Pebble
Limestone (CaCO3)
sedimentary
Fuchsite (Green Muscovite / Mica Schist)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Pink Himalayan Salt Rock
Halite (NaCl with trace iron oxide minerals)
mineral
Honey calcite (orange calcite)
Calcite, calcium carbonate (CaCO₃)
mineral
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Amber Calcite
Calcium Carbonate (CaCO3)
mineral
Pink Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Banded Calcite (often sold as Mexican Onyx or Aragonite)
Calcite/Aragonite (Calcium Carbonate, CaCO3)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Honey Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite and White Calcite
Calcium Carbonate (CaCO3)
mineral
Red faceted gemstone, likely synthetic ruby
Corundum (Al₂O₃), chromium-colored; possibly flame-fusion synthetic ruby
gemstone
Yellow Calcite (Polished)
Calcium Carbonate (CaCO3)
mineral