Dalmatian Jasper
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
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Rhodonite Tumbled Chips
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Magnetite (potentially Hematite)
Magnetite (Fe₃O₄)
mineral
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Red jasper / red chert
Microcrystalline quartz (chalcedony), SiO₂, colored chiefly by iron oxides
sedimentary
Chert (Cream Variety)
Microcrystalline silica (SiO2)
sedimentary
Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)
Silica (SiO2) and Calcium Fluoride (CaF2) based minerals
mineral
Fossilized Crinoid Stem Cross-Section
Crinoidea
fossil
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
metamorphic
Quartz (Rose Quartz or Jasper variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Silicified oyster fossil
Fossil oyster shell, commonly Ostrea or Crassostrea, replaced or encrusted by chalcedony/quartz
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded gneiss
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Mica (Muscovite) in Granite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Sandstone
Arenite (Silicon Dioxide, SiO2 based)
sedimentary
Quartz-bearing granite or pegmatite fragment
Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende
igneous
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Schalenblende
Sphalerite with Wurtzite, Galena, and Marcasite/Pyrite
mineral
Labradorite
(Ca,Na)(Al,Si)4O8 (Plagioclase Feldspar)
mineral
Small brown mineral fragment
Unidentified; the image lacks enough detail for a reliable species-level identification
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Mica (Lepidolite or Muscovite)
Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)
mineral
Amethyst crystal
Silicon Dioxide (SiO2) with iron impurities
mineral
Biotite (Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Mica
Phyllosilicate (group name), typically Muscovite KAl2(AlSi3O10)(OH)2 or Biotite K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Greenschist
Greenschist (Actinolite-Chlorite Schist)
metamorphic