Likely tumbled jasper or chert specimens
Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph
sedimentary
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Rounded chert or chalcedony pebble
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral
Botryoidal chalcedony (gray agate/jasper-like silica)
Microcrystalline quartz, SiO₂; likely chalcedony with opaque quartz or jasper inclusions
mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay-mineral impurities
metamorphic
Howlite
Ca2B5SiO9(OH)5
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled black-and-gold tiger’s-eye
Quartz pseudomorph after crocidolite; SiO₂ with iron oxides
metamorphic
Tumbled howlite (likely)
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Polished brecciated jasper (likely orbicular/picture jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining and breccia fragments
mineral
Polished labradorite cabochon
Labradorite, a calcic plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
mineral
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Hematite
Hematite (Fe2O3)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Lapis Lazuli
Lapis Lazuli (Complex rock containing Sodalite, Lazurite, Calcite, and Pyrite)
metamorphic
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Larvikite
Larvikite (Augite Syenite)
igneous
Labradorite in Matrix
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Ocean Jasper
Silicon Dioxide (SiO2)
Mineral_variety_of_Chalcedony
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/59eef03b-830e-4d54-8641-241ee77e8bf0-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Yellow Jasper
SiO2 (Silicon Dioxide)
sedimentary
Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Petrified Wood
Silicified wood / Xylopal
fossil
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Petrified wood
Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
mineral/sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary