Tumbled smoky quartz (probable)
Quartz, SiO₂; smoky variety colored by irradiation-related defects
mineral
Category
Sedimentary (Artificial)
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Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Blue Goldstone
Man-made glass infused with copper crystals
mineral
Tumbled feldspar-rich rock, likely pink-orange microcline or granite fragment
K-feldspar (microcline/orthoclase), approximately KAlSi₃O₈; exact identification requires testing
mineral
Dyed Agate
SiO2 (Silicon Dioxide)
Mineral
Black volcanic glass (likely obsidian)
Obsidian; predominantly rhyolitic volcanic glass composed chiefly of amorphous SiO₂
igneous
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Rounded granitic gneiss or granite cobble
Biotite granite, possibly weakly foliated granitic gneiss; quartz–feldspar–biotite assemblage
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Polished black stone, likely black jasper or basalt
Most likely microcrystalline quartz (black jasper/chert), SiO₂; basalt is a plausible alternative
mineral
Yellow Agate
SiO2 (Quartz variety)
gemstone
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), naturally irradiated variety
mineral
Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Dyed pink banded agate
Chalcedony (microcrystalline quartz), SiO₂, commonly dyed
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
Mixed sandstone and iron-rich sedimentary rock fragments
Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining
sedimentary
Blue glassy gemstone cabochon, likely dyed chalcedony or glass
Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)
gemstone
Carnelian Agate
SiO2 (Silicon Dioxide - Chalcedony variant)
gemstone
Blue Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Pink Agate
Chalcedony (SiO2)
gemstone
White quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled quartz-rich pebble, possibly calcite or quartzite
Most likely microcrystalline quartz (SiO₂); carbonate identification would require testing
mineral
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Blue chalcedony crystal pendant
Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz
gemstone
Rainbow aura quartz (treated quartz crystal)
Quartz, SiO₂, with a thin artificial metal-oxide coating
mineral
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Green Chalcedony (Batu Akik)
Silicon Dioxide (SiO2)
gemstone
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Dyed Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Red Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - variety Quartzite
metamorphic
Blue glassy tumbled stone, likely blue chalcedony or slag glass
Chalcedony (microcrystalline SiO₂), possibly man-made blue glass
mineral