Manufactured Glass

Concrete or artificial stone core sample

Artificial conglomerate

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Greenish Quartz)

SiO2 (Silicon Dioxide)

Black tumbled stone, likely basalt or black jasper

Most consistent with fine-grained basalt (mainly plagioclase and pyroxene); exact identification requires testing

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz with Mica inclusions

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Polished tiger iron

Tiger iron; interlayered hematite, jasper, and crocidolite-quartz (often riebeckite)

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Small tumbled dark stone, possibly basalt or slag

Likely fine-grained basalt; exact identification is uncertain from the photograph

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Siltstone or Fine-grained)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite

Sandstone (Quartzose)

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

Quartzite

Metamorphosed Sandstone (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite pebble

Quartzite (SiO2 based)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Sandstone

Arenite (SiO2 based)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)