Smoky Quartz with Amethyst
Silicon Dioxide (SiO2)
mineral
Category
Tektite (Natural Glass)
Browse tektite (natural glass) specimens identified by the Rock Identifier community.
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Polished pegmatitic granite (likely graphic granite)
Coarse-grained granitic rock composed chiefly of quartz, feldspar, and biotite/hornblende
igneous
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Pink Fluorite
Fluorite (Calcium Fluoride) - CaF2
mineral
Dream Amethyst (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Apache Tear (Obsidian)
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2), microcrystalline quartz
sedimentary
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz with iron oxide inclusions
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Red Jasper (Polished)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Yellow Jasper
Chalcedony (SiO2 with iron impurities)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (brecciated or orbicular variety)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Polished/tumbled quartz-rich pegmatite
Quartz–feldspar pegmatite, with iron-oxide staining; chiefly SiO₂ and KAlSi₃O₈–NaAlSi₃O₈
igneous
Pink quartz (likely rose quartz)
Quartz, silicon dioxide (SiO₂), commonly rose quartz colored by trace impurities and microscopic inclusions
mineral
Amethyst (Faceted)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Chert with Epidote and Jasper inclusions
SiO2 (Silicon Dioxide) with Ca2(Al, Fe)3(SiO4)3(OH) inclusions
sedimentary
Yellow Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
White Topaz
Al2SiO4(F,OH)2
mineral
Quartz geode / chalcedony nodule
Silica, primarily quartz (SiO₂), with microcrystalline chalcedony
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Likely tumbled dark volcanic rock
Probably basalt or basaltic andesite; exact identification is uncertain from the image
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide)
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)
Quartz, SiO₂, in an unidentified dark silicate matrix
mineral
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Tumbled green aventurine (probable)
Quartz, SiO₂, with fuchsite mica inclusions
mineral