Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Category
Mineral (Extraterrestrial)
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Limonite
FeO(OH)·nH2O
mineral
Dark speckled granite pebble
Granite, a quartz–feldspar–mica plutonic rock
igneous
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Weathered basalt pebble
Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products
igneous
Quartz-rich pegmatite with mica
Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining
igneous
Diorite
Diorite (Phaneritic intermediate plutonic rock)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss (Metamorphic Pebble)
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Granodiorite
Granodiorite
igneous
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Proustite
Proustite (Ag3AsS3)
mineral
Rough Diamond (Bort)
Diamond (C)
mineral
Pegmatitic granite specimen
Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica
igneous
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Granite
Intrusive igneous rock
igneous
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geodic Cavity
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Cobaltian Calcite
Cobalt-bearing Calcite (Ca,Co)CO3
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Serpentinite
Serpentinite, composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)
metamorphic
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Gneiss (likely biotite–quartz–feldspar gneiss)
Foliated gneiss; primarily quartz (SiO₂), feldspar, and biotite mica
metamorphic
Botryoidal Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Pink Granite (Unakite-bearing or Epidote-bearing Granite)
Plutonic Igneous Rock (Granite)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary