Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Biotite (Mica)

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

Carnelian Agate

Carnelian (SiO2 with iron oxide impurities)

Potassium Feldspar (Orthoclase)

KAlSi3O8 (Potassium Aluminum Silicate)

Epidote

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

Coarse Sand or Fine Gravel

Detrital Sedimentary Fragments (mostly SiO2)

Quartz

Silicon Dioxide (SiO₂)

Granite

Granite

Unknown Dark Stone

Unknown

Geode

Quartz / Chalcedony nodule

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Basalt (Weathered River Pebble)

Extrusive Igneous Rock

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Quartz (SiO₂)

Jasper Agate

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Garnet

Garnet Group (e.g., Almandine, Pyrope)

Amethyst Beads

Quartz (Silicon Dioxide, SiO2 with iron impurities)

Serpentine Pebble

Serpentine ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Nile Agate

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Carnelian (Tumbled)

Carnelian (variety of Chalcedony, SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

Gneiss

Foliated Metamorphic Rock

Gneiss (Banded Gneiss)

Gneiss

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Fluorite (Purple Octahedron)

Calcium Fluoride (CaF2)

Amber Agate (Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Hematite

Iron(III) Oxide (Fe2O3)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Greenschist

Greenschist (Chlorite Schist)

Fluorite

Calcium Fluoride (CaF2)

Banded Gneiss

Gneiss

Greenstone

Metabasalt / Greenschist facies rock

Greenstone

Greenschist (Greened Metabasalt)