Sedimentary Or Igneous (Host Environment)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Gold-bearing quartz vein rock

Milky quartz (SiO₂) with probable native gold and iron-oxide staining

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Wishing Stone (Basalt/Greywacke with Quartz Vein)

Basalt or Siltstone with SiO2 (Quartz) hydrothermal intrusion

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Quartz vein rock

Milky quartz with smoky quartz; chiefly silicon dioxide (SiO₂)

Quartz-rich rock, possibly quartz vein material

Likely milky quartz with iron-stained or weathered host rock; exact identification is uncertain from the photo

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (primarily SiO2)

Pyrite-bearing rock (likely pyrite in a quartz-rich matrix)

Pyrite, FeS₂, with an unidentified host rock

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Chert (Yellow/Tan Variety)

Chert (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Pink Chalcedony (Agate/Jasper blend)

Silicon Dioxide (SiO₂)

Likely quartz-rich rock (milky quartz vein material)

Quartz, SiO₂; identification is provisional from the photo

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Fluorite Geode

Calcium Fluoride (CaF2)

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Foliated metamorphic cobble, likely gneiss

Biotite–quartz–feldspar gneiss (tentative)

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Chalcedony (Agate/Jasper mix in host rock)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Quartz (Smoky/Rock Crystal)

Silicon Dioxide (SiO2)

Carnelian Agate

Carnelian (Silicon Dioxide - SiO2)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Pyrite-bearing rock (likely pyrite in a dark host rock)

Pyrite, FeS₂, with an unidentified host matrix

Pyrite-bearing Rock

Iron Sulfide (FeS2) associated with host rock

Quartz pebble with a conchoidal chip

Silicon dioxide (SiO2)

Druzy Quartz on Matrix (Chert/Limestone)

Silicon Dioxide (SiO2) with Carbonate host rock

Quartz (Rose Quartz or Jasper variety)

Silicon Dioxide (SiO2)

Ruby (in jewelry)

Corundum (Al2O3 with Chromium traces)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Weathered flint or chert nodule

Microcrystalline quartz (SiO₂), commonly flint/chert

Dark mineral nodule with white veining

Possibly a calcite-veined manganese- or iron-rich concretion; exact identification requires testing

Quartz-veined Metamorphic Rock (Wishing Stone)

Quartz-veined Metamorphic/Igneous Host Rock with Quartz Veinlets

Beryl (likely Pink/Morganite variety)

Beryllium aluminum silicate (Be3Al2Si6O18)