Sedimentary (Processed Mineral Product)

Bornite (Peacock Ore) / Acid-treated Chalcopyrite

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Limestone

Calcium Carbonate (CaCO3)

Likely botryoidal calcite or aragonite specimen

Calcite (CaCO₃), possibly aragonite (CaCO₃)

Weathered iron-rich rock, possibly limonite/goethite or ironstone

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite and/or magnetite)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Polished Black Basalt Pebble

Basalt

Likely iron sulfide specimen (pyrite or marcasite)

Pyrite, FeS₂; possibly marcasite, also FeS₂

Granite countertop with a small pale mineral fragment

Granite; predominantly quartz, feldspar, and mica

Green aventurine bead bracelet

Quartz (SiO₂), likely fuchsite-bearing aventurine

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Brown shale or mudstone fragment

Likely fissile claystone/shale, composed mainly of compacted clay minerals, quartz, and minor iron oxides

River Stone (likely Siltstone or fine-grained Basalt)

Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)

Blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Botryoidal Goethite

Goethite (α-Fe3+O(OH))

Tumbled and polished quartz crystal points

Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties

Malachite

Copper Carbonate Hydroxide, Cu2CO3(OH)2

Hematite pseudomorph after a fossil or mineralized object (likely iron-oxide concretion)

Hematite, Fe₂O₃, possibly limonite/goethite-bearing

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Likely polished greenstone or serpentine inlay

Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade

Blue tumbled stone, possibly sodalite

Likely sodalite (Na₈(Al₆Si₆O₂₄)Cl₂); identification is uncertain from the image

Tumbled milky quartz

Quartz (SiO₂), microcrystalline or massive variety

Gold-bearing sulfide ore (tentative)

Native gold, likely with pyrite/chalcopyrite in quartz or altered rock

Tumbled Hematite with Quartz/Chert (Specular Hematite)

Fe2O3 (Iron Oxide)

Carved serpentine wing sculpture

Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4

Slate

Metamorphic rock (fine-grained, foliated)

Iron-rich sulfide ore, likely pyrite-bearing gossan

Pyrite (FeS₂), possibly mixed with iron oxides/hydroxides and other sulfides

Gold-bearing Quartz Vein in Mafic Rock

Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)

Iron-rich breccia (hematite–goethite rock)

Hematite (Fe₂O₃) and goethite (FeO(OH)) ironstone, likely ferruginous breccia

Limestone

Calcium Carbonate (CaCO3)

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Botryoidal hematite–goethite specimen

Hematite (Fe₂O₃) with goethite (FeO(OH)), possibly minor manganese oxides

Seraphinite

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony

Desert Rose

Gypsum (CaSO4-2H2O) or Baryte (BaSO4)

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Weathered limestone or concrete-like calcareous rock

Limestone; predominantly calcite (CaCO₃), possibly containing dolomite and silicate impurities

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Quartz-rich pegmatite with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining

Granite (White Granite variant)

Phaneritic Plutonic Rock (High-silica Felsic)

Raw botryoidal goethite/limonite specimen

Goethite (α-FeO(OH)), commonly mixed with limonite (hydrated iron oxides)