Mineral And Metamorphic Rock

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Raw Calcite

Calcium Carbonate (CaCO3)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Shale (possibly Carbonaceous or Oil Shale)

Argillaceous Sedimentary Rock

Fuchsite Gneiss or Schist

Muscovite (variety Fuchsite) within Metamorphic Host Rock

Banded Agate (Gray/Brown)

Silicon Dioxide (SiO2)

Quartz Vein in Greenstone

Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz

SiO2 (Silicon Dioxide)

Unakite Epidote-Granite

Unakite (Epidotized Granite)

Mixed tumbled gemstone and mineral lot

Primarily quartz varieties (SiO₂), feldspar, beryl/chalcedony, and other unidentified silicate minerals

Pyrite in Slate

Iron Disulfide (FeS2) in Low-grade Metamorphic Rock

Gneiss

High-grade metamorphic rock (Gneiss)

Greenstone, likely altered basalt (possibly serpentinite)

Metabasalt/greenschist; commonly chlorite–actinolite–epidote ± serpentine

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Schist

Mica Schist (Metamorphic Rock)

Gneiss (likely biotite–quartz–feldspar gneiss)

Foliated gneiss; primarily quartz (SiO₂), feldspar, and biotite mica

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

Magnetite sand (black iron-oxide sand)

Magnetite, Fe₃O₄; commonly mixed with ilmenite and other heavy minerals

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Garnet-bearing metamorphic rock, possibly garnet amphibolite or mica schist

Almandine garnet (Fe₃Al₂Si₃O₁₂) in a mafic, amphibole–feldspar-rich matrix

Emerald in Matrix (Quartz/Schist)

Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Tumbled translucent pebble, likely quartz or pale chalcedony

Quartz (SiO₂), possibly microcrystalline chalcedony

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky quartz specimen

Quartz (silicon dioxide, SiO₂), commonly massive or drusy quartz

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or iron-oxide impurities

Fuchsite

K(Al,Cr)2(AlSi3)O10(OH)2

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Schist

Crystalline Metamorphic Rock (Schistose)

Gneiss

High-grade Metamorphic Gneiss

Potassium Feldspar (Microcline / Orthoclase)

KAlSi3O8

Garnet Schist

Almandine Garnet-bearing Mica Schist

Lazulite Quartzite

Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)