Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Orange chromium diopside (likely tumbled)
Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion
mineral
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Quartz / Calcite Pebble
SiO2 (Quartz) or CaCO3 (Calcite)
mineral
Agate Geode
Microcrystalline Quartz (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Carbon (C)
gemstone
Bicolor Quartz Pebble
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Granite
Phaneritic plutonic rock (SiO2 typically >69%)
igneous
Chert / River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Small rounded pebble
Unidentified lithic clast; likely fine-grained sandstone, mudstone, or basalt
sedimentary
Quartz Pebble with Hematite Inclusion
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Sandstone (clastic sedimentary rock, mainly SiO2 with iron oxide cement)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Green cabochon gemstone pendant, likely turquoise or dyed green turquoise
Probably turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact identification requires testing
gemstone
Possible weathered quartz-rich rock or iron-stained mineral fragment
Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
White chalcedony or quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar
mineral
Sandstone
Arenite (primarily Quartz and Feldspar composition)
sedimentary
Sandstone
Arenite (primarily Quartz-based)
sedimentary
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide staining/cementing)
sedimentary
Yellow Quartz (Chalcedony)
Quartz / Chalcedony (Silicon Dioxide, SiO2)
mineral
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
mineral (man-made aura treatment)
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Purple Dyed Agate Geode (Banded Chalcedony)
Silicon Dioxide (SiO2) - variety: Agate
mineral
Tumbled white quartz pebble
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Amethyst stalactite slice pendant
Amethyst (紫 quartz), SiO₂, with concentric quartz/chalcedony and likely agate banding
mineral
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Red jasper-bearing breccia (probable)
Microcrystalline quartz (SiO₂) with iron-oxide coloration, in a brecciated host
mineral