Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
igneous
Category
Gemstone
Browse gemstone specimens identified by the Rock Identifier community.
Chert (White Flint)
Silicon Dioxide (SiO2)
sedimentary
Beryl (Emerald or Aquamarine in Matrix)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Aquamarine (Beryl)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Epidote in Quartz (Epidosite)
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Carnelian
SiO2 (Silicon Dioxide), a variety of Chalcedony
mineral
Bicolor Tanzanite
Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon dioxide (SiO2) with Iron inclusions
sedimentary
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Varietal of Quartz), SiO2 (Silicon Dioxide)
mineral
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (K(AlSi3O8))
mineral
Kyawthuite
Kyawthuite (Bi3+Sb5+O4)
mineral
Labradorite
Feldspar (Plagioclase Series), (Ca,Na)(Al,Si)4O8
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with impurities of Iron Oxide
sedimentary
Quartz with Iron Oxide Monzonite or Sandstone contact
Quartz (SiO2) with Limonite/Hematite staining
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Fe2+): Ca2MgAl2(Si2O7)(SiO4)(OH)2∙H2O)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Amethyst
Quartz (Silicon Dioxide) with Iron impurities, SiO2
mineral
Red Coral
Corallium rubrum
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sunstone
Orthoclase or Oligoclase Feldspar (Na,Ca)(Al,Si)4O8
mineral