Jasper with Quartz vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Not A Geological Specimen
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Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Microcline (KAlSi3O8) with Trace Lead
mineral
Beryl in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Orbicular Jasper
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye (and Hematite/Jasper Matrix)
SiO2 (Pseudomorph of Quartz after Crocidolite) with Hematite/Magnetite
mineral
Goethite
Goethite (FeO(OH))
mineral
Amethyst
Crystalline Silicon Dioxide with Iron impurities (SiO2)
mineral
Amethyst (specifically Chevron Amethyst or Dream Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Que Sera Stone (Llanite)
Rhyolite Porphyry with Blue Quartz and Feldspar
igneous
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Greyscale Moonstone / Silver Sheen Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide SiO2)
sedimentary
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Amber (Rough)
Amber (Fossilized Tree Resin, succinite)
mineral
Quartzite River Rock
Quartzite
metamorphic
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Ferruginous Sandstone with Concretion
Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Chert
Chert (SiO2)
sedimentary
Milky Quartz
Silica (SiO2)
mineral
Yellow Quartz (Rough)
Silicon Dioxide (SiO2)
mineral
Chalcedony Geode Fragment
Cryptocrystalline Quartz (SiO2)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Aragonite (Onyx Marble)
Calcium Carbonate (CaCO3), Orthorhombic crystal system
mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Dragon Blood Jasper
Quartz (SiO2) with Epidote and Piedmontite inclusions
sedimentary
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Rhyolitic Tuff (Breccia Type)
Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)
igneous
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid
Amethyst
Quartz (SiO2) variety
Mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary