Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Man Made Mineral Simulant (Glass)
Browse man made mineral simulant (glass) specimens identified by the Rock Identifier community.
Learn about Man Made Mineral Simulant (Glass) in the encyclopedia
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Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Strawberry Quartz (or Sunstone / Tumbled Quartz)
Silicon Dioxide (SiO2) with Hematite/Lepidocrocite inclusions
mineral
Tumbled amethyst
Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Polished black mineral or volcanic glass fragment
Indeterminate; possibly obsidian or black tourmaline
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass (SiO2 with Cristobalite inclusions)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Yellow-brown quartz/chalcedony fragment
Quartz, SiO₂; likely microcrystalline chalcedony with iron-oxide staining
mineral
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Rounded quartz-rich beach pebble
Likely milky quartz or quartzite (SiO₂)
mineral
Obsidian
Volcanic Glass
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Quartzite or Quartz Vein Material
SiO2
metamorphic
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)
igneous
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Fluorite
Calcium fluoride (CaF2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)
mineral
Tumbled rose quartz
Rose quartz (pink quartz), silicon dioxide, SiO₂
mineral
Quartz (White/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Green Fluorite (Botryoidal/Massive)
Calcium Fluoride (CaF2)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
mineral
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Pegmatite (Feldspar and Quartz)
Pegmatite (KAlSi3O8 / SiO2)
igneous
Quartz Pebble (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral