Man Made Material, Not A Natural Rock Or Mineral Specimen

Druzzy Quartz on Matrix

Silicon Dioxide (SiO2)

Jasper (Banded Argillite/Chert mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chrysocolla on Quartz/Rhyolite matrix

Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Limonite and Goethite (Ironstone)

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Sandstone

Arenite (composed primarily of SiO2)

Emerald with Matrix (Emerald in Mica Schist)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Agate with Druzy Quartz

Silicon Dioxide (SiO2)

Banded Agate

Microcrystalline Quartz (SiO2) with impurities

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Botryoidal Chalcedony with Calcite

Chalcedony (SiO2 with accessory minerals, likely CaCO3)

Green Calcite (Onyx Marble)

Calcium Carbonate (CaCO3)

Goethite

Goethite (FeO(OH))

Quartz Pebble (Sea Glass-like Quartz)

Quartz (Silicon Dioxide - SiO2)

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Granite (High-silica plutonic rock)

Quartz Vein with Iron Staining

Silicon Dioxide (SiO2) with limonite/hematite staining

Petrified Wood

Silicified Wood (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Ferruginous Oxides

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Granite

Granite (silica-rich intrusive igneous rock)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Sandstone

Clastic sedimentary rock (primarily SiO2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (SiO2 based)

Amethyst (Tumbled Stone)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Red Dyed Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Basalt (Vesicular)

Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene

Wishing Stone

Greenschist or Basalt with Quartz/Calcite Vein

Rough Ruby (Corundum) in Zoisite Matrix

Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)

Milky Quartz

Silicon Dioxide (SiO2)

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Chert / Pink Chert

Silicon Dioxide (SiO2)

Vesicular Basalt (or Porphyritic Scoria)

Vesicular Basalt

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)