Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Category
Mineral (Metamorphic Pseudomorph)
Browse mineral (metamorphic pseudomorph) specimens identified by the Rock Identifier community.
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Prehnite on Basalt
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Lazulite
Lazulite (MgAl2(PO4)2(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
Mineral
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Magnetite (likely with weathered Limonite/Hematite)
Magnetite (Fe3O4) with iron oxide weathering
mineral
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral
Celadonite in Amygdaloidal Basalt
K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix
igneous
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Dragon Blood Jasper
Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))
sedimentary
Zebra Jasper
Jasper (variety of Quartz/Chalcedony), SiO2
sedimentary
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
metamorphic
Unakite
Epidotized Granite
Igneous rock
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Green Fuchsite in Quartz (sometimes called Green Aventurine)
Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2
metamorphic
Rhodonite
Rhodonite (MnSiO3)
mineral
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Basalt (Greenstone)
Amygdaloidal Basalt / Chloritized Basalt
Igneous
Picasso Stone
Metamorphosed Calcium Carbonate (Limestone)
sedimentary