Peridotite
Peridotite (primarily Olivine and Pyroxene)
igneous
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Chert (specifically Jasper or Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon dioxide (SiO2)
mineral
Diamond
Carbon (C)
Mineral
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Diamond
Carbon (C)
mineral
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Goldstone (with Tiger's Eye and Quartz)
Aventurine glass (Synthetic SiO2 with Cu inclusions)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chert
Silicon dioxide (SiO2)
Sedimentary
Amber
Succinite (fossilized resin)
mineral
Fossil Shark Tooth
Carcharodon sp. (likely Otodus or similar Lamniformes order)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Rough Diamond
Diamond (C)
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Rough Diamond
Diamond (pure Carbon, C)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Peridotite
Peridotite (Ultramafic Rock)
igneous
Kyanite
Kyanite (Al2SiO5)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Amethyst (Silica mineral, SiO2)
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Diamond (Faceted)
Carbon (C)
gemstone
Chert (often called Flint when found in chalk)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Sandstone
Arenite
sedimentary