Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Biogenic)
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Quartz (Smoky/Grey Quartz Variant)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Quartz / Quartzite Pebble
Silicon Dioxide (SiO2)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz with Chlorite or Hornblende inclusions
Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Common or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Ochre / Limonite
Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz (Microcrystalline/Gravel)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
igneous
Sunstone (Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Hematite or Goethite
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Calcite on Limestone
Calcium Carbonate (CaCO3) on Sedimentary Rock
mineral
Amazonite
Microcline (K(AlSi3O8))
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)
mineral
Lake Superior Agate
Silicon Dioxide (Cryptocrystalline Quartz), SiO2
mineral
Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8) with Pb impurities
mineral