Tree Agate (or Moss Agate), faceted into a crystal tower
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Category
Mineral Based Human Made Alloy
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Tumbled hematite (likely hematite-rich ironstone)
Hematite, Fe₂O₃; possibly mixed with magnetite or goethite
mineral
Desert Rose
Selenite Rose (Gypsum: CaSO4·2H2O)
mineral
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Micro-Meteorite (Micrometeoroid)
Extraterrestrial Spherule (Silicate or Iron-Nickel)
mineral
Dyed Fuchsia Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Chondrite Meteorite
Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)
Mineral
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Basalt
Basalt
Igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Polished labradorite cabochon
Labradorite, a calcic plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Flint / Chert with Cortex
Microcrystalline Quartz (SiO2)
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Diamond (or Simulant)
Carbon (C)
gemstone
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Not a rock, mineral, or geological specimen
N/A
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
River Stone (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) based metamorphosed sandstone
metamorphic or sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Worry Stone
Weathered Quartzite or Sandstone
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
mineral
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled quartz (likely milky quartz)
Quartz — silicon dioxide (SiO₂)
mineral
Gold Nugget
Native Gold (Au)
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Blue Goldstone
Aventurine Glass
man-made glass
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Likely slag or metallic industrial byproduct
Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary