Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Category
Man Made Glass
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Citrine Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rose Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Agate (Silicon Dioxide, SiO2)
mineral
Quartz (likely Rose or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper and Chert Conglomerate
Ferruginous Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineraloid
Chalcedony (River Stone)
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
gemstone
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Yellow Quartz (Citrine or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Quartzite (likely dyed)
Silicon dioxide (SiO2) with likely color treatment
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Basalt with Olivine
Aphanitic Basalt with (Mg,Fe)2SiO4 phenocrysts
igneous
Olivine
(Mg, Fe)2SiO4
Mineral
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite (Gold/Yellow)
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Sandstone (Quartzite Pebble)
Arenite / Metamorphosed Sandstone (SiO2)
sedimentary
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary