Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Category
Browse amorphous solid specimens identified by the Rock Identifier community.
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Obsidian
Volcanic Glass (predominantly SiO2)
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Ambergris
Ambra grisea (Metabolic byproduct)
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Apache Tear
Hydrated Obsidian (Natural Volcanic Glass)
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary vugs
Copper-bearing Quartz (likely Chrysocolla or Malachite staining)
Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock
Anthracite Coal
Anthracite (Carbon-based solid)
Obsidian
Volcanic Glass (70-75% SiO2)
Sodium Polyacrylate (Superabsorbent Polymer)
Sodium Polyacrylate [-CH2-CH(COONa)-]n
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
Snowflake Obsidian
Spherulitic Obsidian (SiO2 + impurities)
Ambergris
Physeter macrocephalus excreta (Ambergris)
Slag Glass
Vitreous Silicate Residue
Obsidian
Obsidian (Amorphous Volcanic Glass, SiO2)
Chondrite Meteorite
Stony Meteorite (L, H, or LL Chondrite)
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Apache Tear
Hydrated Obsidian (Volcanic Glass)
Apache Tear
Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)
Apache Tear (Obsidian)
Volcanic glass (SiO2 - Silicon Dioxide)
Obsidian
Volcanic glass (high silica content based on SiO2)
Precious Opal
Hydrated Silica (SiO2·nH2O)
Opal
Hydrated Silica (SiO2·nH2O)
Smoky Quartz (Apache Tear Variety)
Silicon dioxide (SiO2) - Volcanic Glass
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
Geode Nodules / Chalcedony Geode
Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz
Rainbow Obsidian
Volcanic glass (SiO2 - approximately 70% or more silicon dioxide)
Amber
Succinite (Approximate formula: C10H16O)
Green Opal
Hydrated Silica (SiO2·nH2O)
Shell Cameo
Cypraecassis rufa (Bullmouth Queen Helmet Shell)
Opal
Hydrated amorphous silica (SiO2·nH2O)
Quartz Geode
Silicon dioxide (SiO2)
Geode (unopened)
Silica-filled Concretion (SiO2)
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
Geode (unopened nodule)
Silicon Dioxide (SiO2) Nodule
Blue Quartz (Dumortierite Quartz)
Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)