Sedimentary Or Metamorphic (Base Substrate)

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Graphite-rich schist (probable graphite flake)

Graphite (C) in graphitic schist; commonly with quartz, mica, and feldspar

Quartzite Pebble

Quartzite (primarily SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Mica Schist

Mica Schist (Muscovite subclass)

Polished operculum (“Shiva eye” shell)

Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen

Mica Schist fragment

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)

Mica Schist with Pyrite

Mica Schist (FeS2 containing)

Golden Mica Schist

Mica Schist (primarily Muscovite/Biotite with Quartz)

Anthracite Coal

Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Biotite Schist

Biotite-rich Schist

Red Jasper (Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Biotite-rich schist (probable)

Mica schist, rich in biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂); exact identification is uncertain from the image alone.

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Graphite

Graphite (Native Carbon, C)

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Mica-rich metamorphic rock fragments

Biotite schist / mica schist (predominantly biotite, muscovite, and quartz)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Limonite pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O

Pyrite-bearing rock, possibly pyrite-rich schist or quartzite

Pyrite (iron disulfide, FeS₂) in a fine-grained metamorphic or quartz-rich matrix

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

Mica / Muscovite or Biotite

Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)

Schist

Mica Schist

Brown quartz-rich pebble (likely chert or weathered quartzite)

Quartz (SiO₂), possibly microcrystalline quartz/chert or quartzite

Weathered gneiss

Foliated gneiss, chiefly quartz–feldspar–mica

Green chalcedony (possibly chrysoprase) cabochon

Chalcedony, microcrystalline quartz (SiO₂); chrysoprase is nickel-colored chalcedony

Bornite

Bornite (Cu5FeS4)

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Mica-rich rock, likely biotite schist

Mica schist, composed mainly of biotite and/or muscovite with quartz and feldspar

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Mica Schist

Schist (Muscovite/Biotite Schist)

Kyanite

Kyanite (Al2SiO5)

Weathered quartz-rich rock, possibly quartzite

Quartzite (mostly SiO₂), though the photograph is insufficient for confident identification

Biotite Schist

Biotite Schist

Pyrite

Iron Pyrite (FeS2)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)