Sedimentary (Processed Mineral Product)

Quartz (Quartzite Pebble)

Silicon Dioxide (SiO2)

Likely graphite-rich schist or graphite-bearing metamorphic rock

Graphite (C) in a mica/quartz-rich matrix; exact rock name requires testing

Milky quartz

Quartz (silicon dioxide, SiO₂)

Goethite

Goethite (FeO(OH))

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Pumice or Vesicular Basalt

Vesicular volcanic rock

Weathered vesicular basalt

Basalt, chiefly plagioclase and pyroxene with secondary iron oxides and zeolite/calcite fillings

Vesicular scoria (likely iron-rich volcanic scoria)

Scoria, typically basaltic to andesitic; chiefly plagioclase, pyroxene, olivine, and volcanic glass

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Orange Calcite

Calcium Carbonate (CaCO3)

Kyanite

Kyanite (Al2SiO5)

Vesicular basalt (possibly slag-contaminated)

Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals

Chert / Flint

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Flint / Chert Pebble

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Crushed Stone (Basalt/Gabbro)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Raw ruby (corundum)

Ruby variety of corundum, aluminum oxide (Al₂O₃), colored chiefly by chromium

Tumbled milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

Chert (Flint/Jasper variety)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Vesicular scoria (oxidized basaltic scoria)

Scoria; vesicular mafic volcanic rock, typically composed mainly of plagioclase, pyroxene, and iron-rich glass/oxides

Weathered quartz-rich rock fragment

Likely quartz-bearing vein rock, possibly quartzite or silicified breccia; exact identification requires testing

Native metallic specimen, possibly galena or a sulfide-rich ore fragment

Tentatively galena (lead sulfide, PbS), possibly mixed with iron/copper sulfides

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Dragon Vein Agate (Dyed/Treated)

Agate (SiO2)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Milky quartz crystal

Quartz, silicon dioxide (SiO₂), likely a small prismatic crystal or crystal fragment

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

Likely weathered basalt

Basalt; fine-grained mafic rock composed mainly of plagioclase, pyroxene, and commonly olivine or iron oxides

Prehnite

Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)

Pearl

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

Pumice or vesicular volcanic rock

Pumice; predominantly volcanic glass (silica-rich, commonly rhyolitic to dacitic)

Dragon Vein Agate (Dyed/Fractured Quartz)

Silicon dioxide (SiO2)

Tumbled howlite (likely)

Howlite, Ca₂B₅SiO₉(OH)₅

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Diorite (Salt and Pepper Rock)

Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Basalt

Basalt

Granite

Granite (Felsic Plutonic Rock)