Brown Agate
Silicon Dioxide (SiO2)
Category
Browse mineral with metamorphic or igneous host specimens identified by the Rock Identifier community.
Brown Agate
Silicon Dioxide (SiO2)
Quartz Vein in Rhyolite
Silicon Dioxide (SiO2) in extrusive igneous rock
Milky Quartz
Silicon Dioxide (SiO2)
Rose Quartz attached to matrix
Silicon dioxide, SiO2
Schist, likely biotite–muscovite schist
Mica schist; predominantly quartz, feldspar, muscovite and biotite
Quartz-rich pegmatitic rock
Quartz–feldspar pegmatite; chiefly SiO₂ quartz with K-feldspar/plagioclase
Quartz Vein in Basalt
Silica-infilled basaltic host rock
Sapphire
Corundum (Al₂O₃) with trace elements causing color variations.
Lapis lazuli
Lapis lazuli; primarily lazurite (Na₃Ca(Si₃Al₃)O₁₂S), with calcite and pyrite
Blue Apatite
Calcium Fluorophosphate - Ca5(PO4)3F
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor chlorite/talc
Likely pegmatite with quartz and mica
Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica
Lapis Lazuli
Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Quartz/Schist
Blue cabochon gemstone ring
Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel
Copper-bearing altered rock, likely chrysocolla-bearing quartzite or breccia
Quartz (SiO₂) with copper silicate minerals, chiefly chrysocolla [approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O], and iron oxides
Milky quartz
Quartz (SiO₂), commonly massive or vein quartz
Milky Quartz
Quartz (SiO2)
Eudialyte in Matrix
Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3
Schist
Schist (metamorphic rock)
Quartz-bearing pegmatitic rock with feldspar
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
Blue Kyanite
Kyanite (Al2SiO5)
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Stiped Slate Beach Pebble
Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)
Quartz with Epidote / Chlorite Inclusions
Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
Likely smoky quartz fragment
Quartz, SiO₂ (smoky variety)
Quartz vein in a light-colored host rock
Quartz (SiO₂), possibly in quartz-rich vein rock
Rose Quartz
Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)
Feldspar in Matrix
Feldspar group minerals in metamorphic or igneous matrix
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
Agate
Silicon dioxide (SiO2) - Microcrystalline Quartz
Quartz (Pegmatitic Quartz with Feldspar)
SiO2 (Silicon Dioxide)
Milky quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
Veined quartz-bearing metamorphic rock
Likely quartzite or siliceous schist with iron-oxide staining