Metamorphic Rock (For Both Nephrite And Jadeite)

Browse metamorphic rock (for both nephrite and jadeite) specimens identified by the Rock Identifier community.

Pyrite

Pyrite (Iron Disulfide), FeS2

Mineral

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Mineral

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Mineral/Semiprecious Gemstone (variety of Quartz)

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

metamorphic

Agate

Agate (Silicon Dioxide, SiO2)

mineral

Folded Schist / Gneiss (Metamorphic Rock)

Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)

metamorphic

Gneiss (Metamorphic Rock)

Gneiss

metamorphic

Unidentifiable Rock Fragment

Uncertain

Quartzite

Quartzite (SiO2)

metamorphic

Banded River Rock / Gneiss (highly weathered)

Gneiss

Metamorphic rock

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Organic Gemstone (for pearl), Mineral (for sapphire/topaz)

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

metamorphic

Phyllite

Phyllite (Foliated metamorphic rock)

metamorphic

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

metamorphic

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

mineral

Schist

Schist (Crystalline metamorphic rock)

metamorphic

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

metamorphic

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

metamorphic

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Metamorphic

Pink Quartzite

Quartzite (SiO2 with minor iron oxide impurities)

metamorphic

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Mineral (specifically a cryptocrystalline variety of Quartz)