Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Category
Antropogenic (Man Made Glass Byproduct)
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Massive Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Jasper (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (specifically a flint nodule component)
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2) / Rock Crystal
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Plagioclase Feldspar (specifically Albite/Oligoclase)
(Na,Ca)(Si,Al)4O8
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Ferruginous Quartz (Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Quartz (Grey-Green)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Amethyst Agate (Polished Point)
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate, (Mg,Fe)2SiO4
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Celestite (Celectine)
Strontium sulfate (SrSO4)
mineral
Quartzite
Quartzite
metamorphic
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite (Formula: SiO2 primary, with various cements)
sedimentary
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary