Jasper (Imperial Jasper style)
Silicon Dioxide (SiO2) with impurities
sedimentary
Category
Anthropogenic (Man Made Material Processed By Nature)
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Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Red Jasper
Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Green Jasper / Plasma
Microcrystalline Quartz (Chalcedony), SiO2 with inclusions
gemstone
Pumice (likely)
Pumice (extrusive igneous rock)
Igneous
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with hematite/iron oxide coating)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone
Sandstone (enriched with Iron Oxide)
sedimentary
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Diamond
Diamond (C)
Mineral
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Chert (Beach Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Greenstone (Epidosite or Serpentinite)
Metabasalt / Epidote-Chlorite Schist
metamorphic
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Green Fluorite in Host Rock
Fluorite (Calcium Fluoride, CaF2)
mineral
Tumbled sodalite beads
Sodalite, Na8(Al6Si6O24)Cl2, commonly with minor white calcite or nepheline
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2 permineralization)
sedimentary
Anthracite Coal
Anthracite (high-rank coal)
metamorphic
Tiger's Eye (Multicolor/Variegated)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Quartzite
Silicon Dioxide (SiO2)
metamorphic
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Diamond
Diamond (C)
Mineral
Ferruginous Quartzite (Red Chert/Jasper-like)
Metamorphosed Quartzite with Hematite inclusions (SiO2 + Fe2O3)
metamorphic
Blue-dyed howlite beads (likely)
Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise
mineral
Red Sandstone Pebble
Arenite (Iron-oxide stained)
sedimentary
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Ferruginous Jasper (or Hemlithos)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)
sedimentary
Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral