Organic Gem Material (Botanical)

Chert (Flint)

Chert (SiO2)

Limestone with Gastropod Fossil

Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion

Jasper

Jasper (Silicon Dioxide, SiO2)

Petrified wood (polished/cut slab)

Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue

Weathered mafic metamorphic rock, likely serpentinite or altered basalt

Probably serpentinized ultramafic rock; commonly dominated by serpentine-group minerals, with magnetite and altered pyroxene/olivine

Quartz-rich granitic rock, possibly pegmatite

Granite or granitic pegmatite; primarily quartz (SiO₂), feldspar, and minor mica/iron oxides

Possible weathered quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly quartzite or chalcedony

Green faceted gemstone pendant, likely green quartz

Quartz (SiO₂), possibly prasiolite or green-treated quartz

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Quartz-rich pegmatite with mica and dark inclusions

Pegmatite; chiefly quartz (SiO₂), with feldspar and biotite/tourmaline inclusions

Fossilized coral or silicified organic limestone

Likely fossil coral (Scleractinia/Tabulata) replaced or cemented by calcite and silica; exact identification requires close examination

Chert

Chert (Microcrystalline Quartz, SiO2)

Raw turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O; likely turquoise-bearing rock with pale host matrix

Yellow faceted gemstone earrings, likely citrine or yellow beryl

Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈

Blue-green turquoise (probable)

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

Amethyst (rough crystal fragment)

Purple quartz, silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Bamboo Leaf Jasper

Silicified Siltstone or Jasper (SiO2)

Greenstone / altered basalt fragment

Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing

Tumbled coral fragment (likely white calcitic coral)

Calcium carbonate, primarily aragonite or calcite (CaCO₃); exact coral genus cannot be determined from the image

Likely mica-rich metamorphic rock (schist)

Mica schist, probably biotite–muscovite schist; exact identification requires closer examination

Weathered quartz-rich rock, likely quartzite

Quartzite (predominantly quartz, SiO₂), possibly iron-stained quartz vein material

Quartz-rich rock, likely quartzite or milky quartz fragment

Quartzite; predominantly quartz (SiO₂)

Black tourmaline (schorl) crystal fragments

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Tumbled amethyst

Quartz (SiO₂), purple variety colored mainly by iron impurities and irradiation

Sodalite specimens

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with associated feldspar or calcite

Rounded quartz-rich pebble, possibly granite or granitic gneiss

Granite/granitic rock; chiefly quartz (SiO₂), feldspar, and minor mica or mafic minerals

Likely schist or foliated metamorphic rock

Mica schist, possibly amphibole-bearing; composition likely quartz, feldspar, biotite and/or hornblende

Iron-rich volcanic rock, possibly hematite-bearing basalt

Basalt with iron oxides/hydroxides, chiefly hematite (Fe₂O₃) and possibly magnetite (Fe₃O₄)

White quartz-rich rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), possibly with minor feldspar or mica

Weathered quartz-rich rock, likely iron-stained quartzite

Quartzite; predominantly quartz (SiO₂) with iron-oxide coatings

Raw greenish crystal/mineral fragment

Uncertain from image; possibly olivine (forsterite-rich), epidote, or green tourmaline

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Corundum (Sapphire variant)

Aluminum Oxide (Al2O3)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)

Chalcedony

Silicon Dioxide (SiO2)

Fossil Shark Tooth

Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite

Chert (Common Opal/Jasper mix)

Silicon Dioxide (SiO2) with impurities

Jasper

Microcrystalline Quartz (SiO2)

Fossilized Shell

Invertebrate fossil (Bivalvia or Brachiopoda)

Jasper

Microcrystalline Quartz (SiO2)