Man Made Metamorphic Style Composite

Quartz Geode

Macrocrystalline Quartz (SiO2) within a geode structure

Polished honey-colored chalcedony cabochon ring

Microcrystalline quartz (SiO₂), likely yellow/orange chalcedony or agate

Polished turquoise sphere with purple matrix/inclusion

Turquoise, hydrated copper–aluminum phosphate; approximate formula CuAl₆(PO₄)₄(OH)₈·4H₂O

Small rounded pebble (rock type indeterminate)

Unidentified fine-grained lithic pebble

Tumbled turquoise-bearing stone (likely turquoise or chrysocolla)

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; possible chrysocolla: hydrated copper silicate

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Goldstone (likely blue-free synthetic goldstone pendant)

Synthetic aventurine glass; silica glass with dispersed metallic copper crystals

Red cabochon gemstone ring (likely glass or synthetic stone)

Undetermined; the image does not establish a natural mineral identity

Brown chert (flint)

Microcrystalline quartz (SiO₂), varieties called chert or flint

Jasper (Mookaite style)

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Quartz on Chlorite Schist

Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)

Bivalve shell fossil or modern shell

Calcareous bivalve shell, composed mainly of calcium carbonate (typically aragonite and/or calcite); species cannot be determined from this view

Polished/tumbled stone, likely serpentine or agate

Probable serpentine-group mineral (antigorite/lizardite), possibly a green jasper or agate; image is insufficient for certainty

Quartzite

Quartzite

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Cantera Opal (Mexican Fire Opal in Rhyolite Matrix)

Hydrated amorphous silica in rhyolite (SiO2·nH2O in volcanic matrix)

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Basalt

Basalt

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Blue tumbled glass or dyed stone (uncertain)

Unidentified; appearance is consistent with blue glass, but a blue mineral such as dyed quartz cannot be ruled out from the photo

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Quartz geode with druzy crystals

Quartz (SiO₂), likely with iron-oxide staining and darker host rock

Likely biotite mica in a host rock

Biotite, a dark mica-group mineral; composition varies, broadly K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Likely slate fragment

Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich

Yellow chalcedony (likely agate) cabochons

Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally colored or dyed

Eclogite

Eclogite

Granite

Felsic Plutonic Rock

Granite

Granite (plutonic igneous rock)

Rounded green-gray pebble, likely serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Tumbled quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphically recrystallized

Quartz-rich rock fragment

Likely milky quartz (SiO₂), possibly a pale quartzite fragment

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Cleaved feldspar crystal (likely plagioclase)

Plagioclase feldspar, approximately NaAlSi₃O₈–CaAl₂Si₂O₈ solid solution

Milky quartz

Quartz (SiO₂), likely massive to small-crystalline variety

Sandstone

Arenite (composed primarily of Quartz: SiO2)