Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Category
Not A Geological Specimen
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Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Mixed polished gemstone and mineral collection
Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces
gemstone
Weathered vesicular volcanic rock, likely basaltic scoria
Vesicular basalt/scoria; chiefly plagioclase, pyroxene, and iron oxides
igneous
Ironstone Concretion / Limonite Crust
Hydrated iron oxide (FeOx·nH2O)
sedimentary
Biotite Schist
Metamorphic Schist containing biotite mica
metamorphic
Dinosaur Bone (Fossilized Bone)
Permineralized Dinosaur Bone (Bio-apatite replaced by quartz/silica)
fossil
Fossilized Coral
Rugosa or Tabulata coral fossil (SiO2)
fossil
Fossilized Dinosaur Bone
Permineralized Vertebrate Bone (Apatite/Quartz replacement)
fossil
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
Weathered iron-rich rock (likely ironstone)
Ferruginous ironstone, composed chiefly of iron oxides/hydroxides such as goethite (FeO(OH)) and hematite (Fe₂O₃)
sedimentary
Fossil coral (likely tabulate or colonial coral)
Fossilized colonial coral; exact genus indeterminate from the photograph
fossil
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)
sedimentary
Weathered granite (granite cobble)
Granite, chiefly quartz, feldspar, and mica; dark vein likely mafic mineral concentration or iron-oxide-stained fracture
igneous
Volcanic Breccia
Pyroclastic breccia
igneous
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Fragments
sedimentary
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Moqui Marble (Shaman Stone)
Ironstone Concretion (Goethite/Hematite over Sandstone)
sedimentary
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Moqui Marble (Iron Concretion)
Hematite/Goethite Concretion (Fe2O3 / FeO(OH))
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Limestone Concretion
Calcium Carbonate Concretion (CaCO3)
sedimentary
Quartz vein fragment
Milky quartz (SiO₂), possibly with weathered host rock
metamorphic
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Lujavrite
Nepheline Syenite
igneous
Granite
Granite, composed chiefly of quartz, feldspar, and mica
igneous
Fulgurite
Lechatelierite (Silica glass tube)
mineral
Banded Siltstone
Banded Siltstone / Laminated Siltstone
sedimentary
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
Polymict breccia (likely impact breccia)
Polymict lithic breccia; composition appears basaltic/mafic clasts in a dark, fine-grained matrix
igneous
Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Quartz-rich pegmatite (likely feldspar and quartz)
Granitic pegmatite composed mainly of quartz (SiO₂) and feldspars
igneous
Vesicular Basalt with Epidote/Amygdaloidal Basalt
Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)
igneous
Quartzite Pebble (or Quartz Pebble)
Quartzite (SiO2)
metamorphic
Sandstone (with differential weathering)
Arenite / Quartz Sandstone (SiO2)
sedimentary
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Granite Pebble
Granite
igneous
Desert Rose (Gypsum Rose / Barite Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O) or Barium Sulfate (BaSO4) with Sand inclusions
mineral
Basalt with Fusion Crust (Meteorite-like appearance)
Vesicular Basalt
igneous
Fossilized Coral
Scleractinia (Agatized or Calcite replaced)
fossil