Mineral With Metamorphic Or Sedimentary Host

Chalcedony

Cryptocrystalline Quartz (SiO2)

Chalcedony on Ironstone

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeOOH)

Greenstone or Chlorite Schist

Greenschist / Chlorite schist

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Rock crystal quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz Geode

Silicon Dioxide (SiO2) in Geodic Cavity

Turquoise

Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)

Quartz Geode

Silicon Dioxide (SiO2) in a sedimentary or volcanic host

Quartz-rich metamorphic rock, likely quartzite or quartz-veined schist

Quartz (SiO₂) with mica/chlorite-rich schistose matrix; possibly minor feldspar and sulfides

Unakite

Altered granite (Epidote, Orthoclase Feldspar, and Quartz)

Likely tiger’s-eye rough fragment

Tiger’s-eye (quartz, SiO₂, with fibrous crocidolite-derived inclusions)

Wishing Stone (Veined Pebble)

Quartz-veined Metasedimentary Pebble

Quartz

Quartz (SiO2 - Silicon Dioxide)

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation

Galena

Galena (lead sulfide, PbS)

Milky quartz vein rock

Quartz, SiO₂; likely massive vein quartz with iron-oxide staining

Black Tourmaline

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

Quartz-rich vein rock (milky quartz with dark host-rock inclusions)

Predominantly quartz (SiO₂), with unidentified dark silicate/mineral inclusions; exact rock type cannot be confirmed visually

Botryoidal chalcedony (likely common opal)

Silica, SiO₂; chalcedony is microcrystalline quartz, while opal is hydrated amorphous silica (SiO₂·nH₂O)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Shatter Cone

Impactite (Shatter Cone texture)

Galena-bearing metamorphic rock (tentative)

Likely galena (PbS) with quartz and/or carbonate matrix; exact identification requires testing

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a granitic or metamorphic matrix

Likely quartz-rich rock (milky quartz vein material)

Quartz, SiO₂; identification is provisional from the photo

Blue kyanite

Kyanite (Al₂SiO₅)

Garnet

Garnet-group silicate, likely almandine–spessartine; general formula X₃Y₂(SiO₄)₃

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Pyrite-bearing metamorphic rock, likely pyrite schist or pyrite-rich slate

Pyrite (FeS₂) in a foliated quartz–mica-rich host

Amethyst (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tumbled yellow jasper (probable)

Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz vein rock with iron-oxide staining

Milky quartz (SiO₂), locally stained by hematite/goethite; possible feldspar or host-rock fragments

Septarian Nodule (Dragon Stone)

Septarian Concretion (CaCO3 with Calcite, Aragonite, and Limestone/Bentonite)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Chalcedony (Agate / Quartz Pebble)

Silicon Dioxide (SiO2)