Chert (Flint with Iron Staining)
Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
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Quartz pebble / Quartzite
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite (weathered pebble)
Granite (plutonic igneous rock)
Igneous
Bi-Color Tourmaline (or Watermelon Tourmaline)
Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)
Mineral
Quartz (Agate/Chalcedony nodule)
Silicon dioxide (SiO2)
mineral
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist
Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc
metamorphic
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Lepidolite in Quartz (Obelisk)
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite)
metamorphic
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Yellow Quartzite (River Pebble)
Quartzite (mainly SiO2 with iron oxide impurities)
metamorphic
Tumbled White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Quartz with Spessartine Garnet and Iron Staining
Silicon Dioxide (SiO2) with Almandine-Spessartine (Mn3Al2(SiO4)3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Petrified Bone Pebble
Silicified Fossilized Bone
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Greenstone / Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)
metamorphic
Garnet (likely Almandine or a blend)
Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.
Mineral
Chrysocolla
Chrysocolla, (Cu, Al)2H2Si2O5(OH)4·nH2O
mineral
Fluorite Tower
Calcium Fluoride (CaF2)
mineral
Quartz with Chlorite or Hornblende inclusions
Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite
igneous
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary