Industrial Byproduct (Anthropogenic Material)

Diamond (or Diamond Simulant like Cubic Zirconia)

Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), probably rock crystal; exact identification is uncertain from the strongly backlit image

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Dalmatian jasper (often sold as Dalmatian stone)

Quartz- and feldspar-rich porphyritic volcanic rock; the trade name “Dalmatian jasper” is not a formal mineral species

Blue-green rough mineral specimen (identity uncertain)

Undetermined; the image is insufficient for a reliable mineral identification

Polished ocean jasper (orbicular jasper)

Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony

Coal (Bituminous / Anthracite)

Carbonaceous Sedimentary Rock (C)

Tumbled unakite

Unakite: epidote, pink potassium feldspar (orthoclase), and commonly quartz

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Schist

Mica Schist

Paper (Cellulose)

Cellulose (C6H10O5)n

Pink-and-cream mineral bead bracelet (likely rose quartz and pale quartz)

Quartz, SiO₂; rose quartz is pink quartz, though the beads may include other pale stones.

Diamond

C (Carbon)

Possible sea glass (naturally frosted glass), not a confirmed geological specimen

Man-made silicate glass; composition varies, commonly soda-lime glass

Bronze or iron-age decorated pottery sherd

Archaeological ceramic fragment; likely fired clay with impressed or molded decoration, not a natural rock

Diamond

Diamond (pure Carbon, C)

Diamond (in Jewelry)

Carbon (C)

Diamond

Carbon (C)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Cut red gemstone, likely ruby

Ruby, gem-quality corundum (Al₂O₃) colored by chromium

Iron-stained quartz-rich rock, possibly weathered granite or pegmatite

Quartz–feldspar rock with iron-oxide alteration; exact identification is uncertain from the photograph

Man-made Carved Stone (Scream Mask/Skull motif)

Carved Soapstone or Serpentine-rich rock

Unidentified weathered mineral/rock fragment

Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen

Cream-colored tumbled stone, possibly calcite

Unidentified; appearance alone is insufficient to distinguish calcite from other pale minerals or stone

Glass

Amorphous Silicon Dioxide (SiO2)

Likely dyed or painted stone

Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.

Blue sapphire (rough corundum)

Corundum, Al₂O₃; blue color commonly from trace iron and titanium

Pale green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

Rounded river pebble, likely quartz-rich sandstone or weathered granite

Indeterminate lithic clast; probable quartz–feldspar aggregate with iron-oxide staining

Peach moonstone (polished/tumbled feldspar)

Orthoclase feldspar, KAlSi₃O₈ (possibly with albite intergrowths)

Pink feldspar fragment (likely orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Tumbled green aventurine (probable)

Quartz (SiO₂), commonly with fuchsite mica inclusions

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled blue-green stone, likely aventurine or serpentine

Quartz-rich aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing

Dyed blue tumbled stone, likely howlite or magnesite

Howlite (Ca₂B₅SiO₉(OH)₅) or magnesite (MgCO₃), artificially dyed blue

Quartzite Pebble

Quartzite (SiO2)

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Sandstone

Arenite (Sandstone)

Basalt Pebble

Basalt (Mafic volcanic rock)

Quartzite

Quartzite (primarily SiO2)

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions