Granite
Intrusive Igneous Rock
igneous
Category
Mineral (Metal)
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Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Gold-bearing quartz vein specimen
Native gold (Au) in quartz (SiO₂), likely with iron-oxide staining
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Beryl (likely Aquamarine) in matrix
Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)
mineral
Polished blue-green calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions
gemstone
Turquoise cabochon (likely stabilized or imitation)
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Carbonaceous Chondrite (CV3 type)
Carbonaceous Chondrite (CV3 group)
meteorite
Iron-rich meteorite candidate
Undetermined stony-iron or iron meteorite; possible weathered iron meteorite
meteorite
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Granite featuring Quartz Vein
Granite with hydrothermal silica (SiO2) intrusion
igneous
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Gold-colored mineral specimen, likely pyrite or weathered mica schist
Tentatively pyrite (FeS₂); identification is uncertain from the obscured image
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Black spinel bead bracelet
Spinel (magnesium aluminate), MgAl₂O₄
gemstone
Mica Schist (with Muscovite mica)
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Pyrite
Iron Sulfide (FeS2)
mineral
Serpentinite
Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)
metamorphic
Amethyst (as seen in jewelry)
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Diamond
Carbon (C)
mineral
Granite
Phaneritic Igneous Rock
igneous
Dyed Blue Agate (Slab)
Agate (Variety of Chalcedony/Microcrystalline Quartz), SiO2
mineral
Granite
Phaneritic Igneous Rock (Granite)
igneous
Ferruginous Sandstone (ironstone)
Sandstone with iron oxide cement (limonite/hematite)
sedimentary
Possible basaltic rock or meteorite candidate
Likely vesicular basalt; meteorite identification cannot be confirmed visually
igneous
Stony Meteorite (Chondrite)
Ordinary Chondrite (L or H type)
meteorite
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Banded Calcite (Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Titanium Coated Kyanite (Aura Kyanite)
Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating
metamorphic
Mohave Turquoise (Composite/Stabilized)
Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions
mineral
Likely iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)
mineral
Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Amethyst, Aquamarine, and Pearl Ring
SiO2 (Amethyst), Be3Al2Si6O18 (Aquamarine), CaCO3 (Pearl)
gemstone