Chert (Jasper/Flint variety)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
Azurite
Azurite (Copper Carbonate Hydroxide), Cu3(CO3)2(OH)2
mineral
Granite
Granite (Mainly Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Milky Quartz (Silicon Dioxide, SiO2)
mineral
Chert (specifically Jasper or Brown Chert node)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Carnelian Agate/Jasper blend
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Coquina / Limonite-stained Limestone
Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)
sedimentary
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Quartzite (Nodule)
Quartzite (SiO2)
metamorphic
Chert (Jasper/River Stone)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Porphyritic Basalt (likely Chinese Writing Stone)
Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix
igneous
Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Chalcedony
Silicon dioxide (SiO2) - Microcrystalline quartz
mineral
Greenschist
Greenschist facies rock
Metamorphic
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Amber
Succinite (organic fossilized resin)
mineraloid
Gray Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Azurite with Malachite
Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
Conglomerate
Conglomerate
Sedimentary Rock
Pink Fluorite
Fluorite (Calcium Fluoride) - CaF2
mineral
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
mineral
Chevron Amethyst
SiO2 (Quartz with Manganese/Iron impurities)
mineral
Chert (specifically Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Schist
N/A (a rock type, not a mineral formula)
metamorphic
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Rutilated Quartz
Quartz with Rutile Inclusions (SiO2 with TiO2 inclusions)
Mineral