Man Made Material, Not A Natural Rock Or Mineral Specimen

Diamond

Diamond (pure Carbon, C)

Red Painted Rock

Artificial Coated Lithic Fragment

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Moldavite

Moldavite (Silica-rich glass, SiO2 + Al2O3)

Rounded pebble, likely quartz-rich sandstone or chert

Indeterminate lithic clast; possibly quartz arenite or microcrystalline quartz (SiO₂)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Petoskey Stone / Rugose Coral Fossil

Hexagonaria percarinata

Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony

Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)

Uncertain polymict breccia or altered volcanic rock

Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Coquina

Bioclastic Limestone

Worn quartz-rich pebble, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly quartzite

Quartzite

Quartzite (predominantly SiO2)

Chalcedony (likely iron-stained agate)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Diamond (in jewelry)

Element Carbon (C)

Blue chalcedony cabochon (probable)

Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)

Copper Ore with Malachite and Chalcocite

Copper-bearing Mineral Assemblage (Cu2CO3(OH)2 + Cu2S)

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Quartz-bearing altered rock, possibly iron-stained quartz vein

Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining

Smoky quartz

Quartz (SiO₂), brown-to-gray smoky variety

Quartz with inclusions

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Chalcedony (Common Opal or Agate variant)

Silicon dioxide (SiO2) with trace hydration

Quartz (Pebble)

Silicon Dioxide (SiO2)

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Diamond inlaid in Jewelry

Carbon (C)

Weathered quartz-rich sandstone or granitic rock

Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite

Ferruginous Quartz Cobble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Onyx (Black) and Mother of Pearl Inlay

Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl

Banded gneiss (weathered glacial erratic)

Gneiss; typically quartz–feldspar–biotite ± hornblende

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)

Quartz-rich rock, likely chert or chalcedony

Microcrystalline silica (SiO₂), possibly quartz/chalcedony

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Vesicular basalt (possibly amygdaloidal basalt)

Basalt, chiefly plagioclase feldspar and pyroxene, with possible olivine and secondary mineral infillings

Jasper with Quartz Veining

Microcrystalline quartz (SiO2) with iron oxide impurities

Milky Quartz

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Pink chalcedony (likely rough agate/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-bearing

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)