Anthropogenic (Man Made Product Subject To Geological Processes)

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Tumbled jasper (possibly orbicular jasper)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Polished brown jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay impurities

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartz-rich rock (likely iron-stained vein quartz)

Predominantly quartz (SiO₂), with possible iron-oxide staining and minor host-rock minerals

Bituminous Coal

Organic sedimentary rock (humic coal)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Red jasper (likely polished/chipped fragment)

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Hematite Nodule

Hematite (Fe2O3)

Quartz-rich breccia or silicified rock

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/calcite fragments

Quartz Vein Rock

Silicon Dioxide (SiO2)

Pink Quartzite

Silica (SiO2) - Metamorphic rock

Seraphinite

Clinochlore (a variety of the chlorite group)

Hematite (or Magnetite iron ore gravel)

Hematite (Fe2O3) / Magnetite (Fe3O4)

Polished jasper pebble

Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions

Red-and-brown agate bead bracelet

Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides

Red jasper (likely polished/tumbled)

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Polished orange jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Tumbled brown chalcedony (possibly carnelian or agate)

Microcrystalline quartz, SiO₂; exact variety cannot be confirmed from the photo

Red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Pearl

Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)

Iron-stained quartz (likely quartz vein material)

Quartz, SiO₂, with iron-oxide staining (commonly goethite and/or hematite)

Polished carnelian agate

Carnelian, a translucent orange variety of chalcedony (microcrystalline quartz, SiO₂)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Iron-stained quartz cluster (likely druzy quartz)

Quartz, SiO₂, with iron-oxide staining

Milky Quartz

Silicon Dioxide (SiO2)

Beach sand with a dark pebble

Unconsolidated siliciclastic sediment, chiefly quartz and feldspar; dark pebble likely basalt or volcanic rock

Tumbled red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Banded ironstone (likely iron-rich metamorphic rock)

Ferruginous quartzite or ironstone; exact identification requires examination of a fresh surface

Polished yellow-brown jasper

Jasper, a microcrystalline variety of quartz (SiO₂), commonly containing iron-oxide impurities

Polished red jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Quartzite

Quartzite (SiO2)

Quartz (Milky/Bull Quartz)

Silicon Dioxide (SiO2)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Quartz Vein in Host Rock (Gabbro or Basalt)

Silicon Dioxide (SiO2) with Mafic Silicates

Turquoise

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

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70–75% SiO2)

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with angular fragments cemented by silica or iron oxides

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide impurities