Quartz with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled blue stone, likely sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue calcite or dyed material
mineral
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Greywacke (Sandstone)
Lithic wacke
sedimentary
Tumbled jasper (likely brecciated or multicolored jasper)
Microcrystalline quartz/chalcedony, SiO₂; jasper is an impure, opaque variety
mineral
Concretion or weathered iron-rich rock
Likely limonite/goethite-rich concretion; exact identification requires testing
sedimentary
Rough Diamond
Carbon (C)
gemstone
Peridot in Matrix
Olivine ((Mg,Fe)2SiO4)
mineral
Pink tourmaline crystal (likely polished or rough-cut)
Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃
gemstone
Rough Diamond
Diamond (pure Carbon, C)
mineral
Faceted purple gemstone, likely amethyst
Amethyst, purple variety of quartz (SiO₂)
gemstone
Milky quartz vein material
Quartz, silicon dioxide (SiO₂), likely massive vein quartz
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Multicolor quartz bead bracelet
Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz
gemstone
Weathered brown rock fragment, possibly iron-rich sandstone or altered basalt
Indeterminate; likely an iron-oxide–stained silicate rock
igneous
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Porous iron-rich rock or slag-like material
Unidentified; possibly limonite/goethite-rich ironstone
igneous
Diamond
Diamond (pure carbon, C)
mineral
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Diamond (likely) in an antique gold ring
Diamond, crystalline carbon (C)
gemstone
Green rough emerald (probable)
Beryl, Be₃Al₂Si₆O₁₈; green color typically from chromium and/or vanadium
mineral
Faceted red gemstone, likely synthetic ruby or red spinel
Possibly corundum (Al₂O₃, ruby) or spinel (MgAl₂O₄); identity cannot be confirmed from the image
gemstone
Amethyst-bearing quartz
Quartz (SiO₂), purple variety amethyst; possibly attached to pale quartz or host rock
mineral
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Botryoidal prehnite
Prehnite, Ca₂Al(AlSi₃O₁₀)(OH)₂
mineral
Reddish-brown tumbled stone, possibly jasper
Unidentified iron-oxide-stained silicate; exact material cannot be determined from the image
mineral
Sandstone (Red/Brown)
Arenite (SiO2 dominated with iron oxides)
sedimentary
Red sandstone pebble
Quartz-rich sandstone, likely ferruginous arkose or litharenite
sedimentary