Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Category
Mineraloid (Man Made Glass)
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Quartzite Pebble
Quartzite (SiO2 silicon dioxide)
metamorphic
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Rock (chiefly Silicon Dioxide, SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Quartzite River Pebble
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Red Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
mineral
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Aventurine
Aventurine Quartz (SiO2)
mineral
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Calcite Crystals
Sedimentary Rock containing Calcium Carbonate (CaCO3)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Chert / Microcrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Green Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mica-rich Schist fragment
Mica Schist
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Yellow/Citrine variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Libyan Desert Glass
Impactite (vitreous silica), SiO2
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Leopard Skin Jasper
Silicified Rhyolite or Orbicular Jasper (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Geode fragment, likely quartz-lined basalt or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly with iron-oxide staining in a basaltic host
mineral
Tumbled brown stone, likely smoky quartz or brown jasper
Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty
mineral
Tumbled white quartz or quartzite pebble
Quartz (SiO₂), possibly massive quartzite
mineral
Translucent agate/chalcedony
Microcrystalline quartz (SiO₂), likely chalcedony with agate-like banding
mineral
Tumbled blue stone, likely blue aventurine or dyed quartzite
Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
mineral