Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
Learn about Synthetic (Man Made Glass) in the encyclopedia
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Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Quartzite Pebble
Metamorphic Rock (mainly Silicon Dioxide, SiO2)
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
mineral
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Blue chalcedony (likely dyed or polished)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Scoria
Scoriaceous Basalt
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (White/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz (Rose or Milky variety fragment)
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Jasper
Chalcedony (SiO2)
Sedimentary/Mineral
Quartzite
Quartzite
metamorphic
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
mineral
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Basalt
Basalt (Aphanitic Igneous Rock)
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz
Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph
metamorphic
Polished blue chalcedony (likely blue quartz/chalcedony)
Microcrystalline quartz, SiO₂; blue color commonly from inclusions or coloration
gemstone
Tumbled quartz-rich pebble, possibly quartzite
Quartzite (mostly SiO₂), or quartz-bearing chert; exact identification requires testing
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Clear Quartz (Carved Dragon)
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary