Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
igneous
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions
Mineraloid
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Chrysocolla in Matrix
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O))
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
mineral
Yellow Jasper
Silicon dioxide with iron inclusions (SiO2)
mineral
Beryl (Aquamarine) in Matrix
Beryllium aluminum silicate (Be3Al2(SiO3)6)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of Quartz and Potassium Feldspar)
igneous
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
mineral
Blue Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Rose Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Red Quartz (Ferruginous Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈)
mineral
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Al)), formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2∙H2O
mineral
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety
Mineral
Sapphire
Corundum (Al2O3)
mineral
Green Aventurine
SiO2
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Citrine
Quartz (SiO₂)
mineral
Sunstone (variety of Feldspar)
Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8
Mineral
Blue Dumortierite in Quartz
Al7(BO3)(SiO4)3O3 (Dumortierite)
mineral
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Jadeite (Nephrite)
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Dumortierite Quartz
Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)
metamorphic
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Ruby (varieties of Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Ruby in Zoisite
Anyolite (composite of Corundum and Zoisite)
metamorphic
Amazonite
Microcline (K(AlSi3O8))
mineral