Mineral (Man Enhanced)

Mixed polished gemstone bead lot, likely dyed agate and quartz

Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)

Red Agate Sphere

Chalcedony (SiO2 with iron oxide inclusions)

Yellow Quartz

Silicon Dioxide (SiO2)

Garnet

Garnet group species (likely Almandine, Fe3Al2(SiO4)3)

Weathered fossiliferous limestone fragment, possibly fossil coral or shell material

Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone

Clear Calcite

Calcite (Calcium Carbonate, CaCO3)

Likely vesicular basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase, pyroxene, and sometimes olivine

Celestite

Celestine (SrSO4)

Dark basalt or basaltic volcanic rock

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Calcite

Calcium Carbonate (CaCO3)

Native Copper

Native Copper (Cu)

Basalt

Basalt (Mafic volcanic rock)

Limonite (Iron Ore)

Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Jade (likely Jadeite or Nephrite)

Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Blue-dyed howlite beads (likely)

Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise

Weathered iron-stained quartzite or jasper

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and limonite

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), naturally irradiated variety

Limonite (Iron Ore)

Hydrated ferric oxide mixture (FeO(OH)·nH2O)

Malachite

Malachite — Cu₂CO₃(OH)₂, hydrated copper carbonate

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Milky quartz fragments

Quartz (silicon dioxide, SiO₂)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Metallic sulfide mineral fragment, likely bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Blue mineral specimen, likely bornite (“peacock ore”)

Bornite, Cu5FeS4, possibly iridescent chalcopyrite (CuFeS2)

Fluorite

Calcium fluoride (CaF2)

Black Agate

Silicon Dioxide (SiO2) with carbon/iron inclusions

Gold Nugget

Native Gold (Au)

Weathered gneiss

Banded gneiss, commonly composed of quartz, feldspar, and mica

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Chalcedony

Silicon Dioxide (SiO2)

Limonite pseudo-concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Fluorite

Calcium fluoride (CaF2)

Native Copper

Native Copper (Cu)

Diorite

Diorite (intermediate plutonic rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Tumbled white quartz

Quartz (silicon dioxide, SiO₂), likely milky quartz

Quartz Druze

Silicon Dioxide (SiO2)