Anthropogenic Material

Small rounded pebble, likely weathered sandstone or iron-rich rock

Indeterminate; possibly quartz-rich sandstone (SiO₂) with iron-oxide staining

Iron-rich chert or jasper fragment

Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides

Siltstone

Siltstone (composed of clastic quartz and feldspar grains)

Tumbled chert or chalcedony pebble

Microcrystalline quartz (SiO₂), likely chert/chalcedony

Quartz Pebble

Silicon Dioxide (SiO2)

Botryoidal chalcedony (likely agate/jasper matrix)

Microcrystalline quartz, SiO₂; commonly containing iron-oxide impurities

Tumbled blue stone, likely blue aventurine or dyed quartz

Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing

Rounded iron-stained quartzite or sandstone pebble

Quartzite, predominantly SiO₂, with iron-oxide staining

Weathered iron-rich rock, likely laterite or ironstone

Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals

Siltstone

Siltstone (composed of microscopic quartz and clay minerals)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Quartzite pebble

Quartzite (SiO2)

Quartzite

Quartzite (composed primarily of SiO2)

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Note: No specimen visible

Crushed Granite / Landscaping Gravel

Granitoid

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly antigorite/lizardite/chrysotile, commonly after peridotite (olivine–pyroxene)

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relic olivine/pyroxene

Chalcedony (Chert/Flint)

Silicon Dioxide (SiO2)

Pink tourmaline rough crystals

Elbaite tourmaline, Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Red garnet bead

Likely almandine–pyrope garnet, garnet-group silicate (approximately Fe₃Al₂Si₃O₁₂–Mg₃Al₂Si₃O₁₂)

Diamond

C

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Polished kambaba jasper

Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions

Rhinestone (or glass crystal)

Silicon dioxide (if glass) / Various

Dark green metamorphic rock, likely serpentinite

Serpentinite, chiefly serpentine-group minerals (antigorite/lizardite/chrysotile), commonly with magnetite and chromite

Mica schist (likely biotite–muscovite schist)

Mica schist; chiefly quartz (SiO₂) plus muscovite and biotite mica, with possible garnet or graphite

Likely raw blue kyanite specimens

Kyanite, Al₂SiO₅

Siltstone

Siltstone (primarily SiO2 with various silicates)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Possible weathered basalt or iron-rich volcanic stone

Fine-grained mafic rock, possibly basalt; exact identification requires testing

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), with dark biotite, amphibole, or iron-oxide inclusions

Likely weathered igneous rock fragments

Indeterminate; possibly basaltic or granitic rock with quartz, feldspar, and dark mafic minerals

Iron-stained milky quartz vein

Quartz (SiO₂), with iron-oxide/hydroxide staining and minor dark inclusions

Polished/tumbled rhodonite-rich stone

Rhodonite (MnSiO₃), likely mixed with quartz and manganese oxides

White quartzite pebble

Quartzite; predominantly microcrystalline quartz (SiO₂)

Quartzite River Pebble

Quartzite (primarily SiO2)

Dyed tumbled stone, likely chalcedony or quartz

Microcrystalline quartz (SiO₂), probably dyed magenta

Chert

Microcrystalline Quartz (SiO2)

Chert pebble

Microcrystalline silica (SiO2)

Granite or Pegmatite in host rock

Granitoid / Felsic Intrusive Rock