Tumbled jasper, likely picture jasper or brecciated jasper
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments
mineral
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Tumbled green gemstone, likely dyed howlite or serpentine
Most consistent with dyed howlite (Ca2B5SiO9(OH)5); exact identification requires testing
mineral
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Worked chert (likely flint)
Microcrystalline quartz/chalcedony, SiO₂
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Pink Dyed Agate (Banded Chalcedony)
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Sand Tiger Shark Tooth (Fossil)
Carcharias taurus (fossilized dentin/enameloid)
fossil
Amber
Succinite (Organic Mineraloid)
mineral
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Mineral Simulant (Synthetic Glass)
Quartz
Silicon Dioxide (SiO₂)
Mineral
Tumbled quartz (likely rose or milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (color due to lead)
mineral
Likely vesicular basalt (scoria)
Basaltic scoria; chiefly plagioclase, pyroxene, and olivine with vesicles
igneous
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Natural Diamond (Carbon, C)
gemstone
Diamond / Clear Quartz / Glass paste
Carbon (Diamond) / Silicon Dioxide (Quartz)
gemstone
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Chert
Chert (microcrystalline quartz, SiO2)
sedimentary
Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Polished white agate or chalcedony bead
Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion
gemstone
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Possible iron-rich basalt or industrial slag
Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image
igneous
Note: Item is not a geological specimen
n/a
none
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
igneous
Halite
Halite (Sodium Chloride, NaCl)
mineral