Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
Category
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
Quartz Pebble (Sea Glass-like Quartz)
Quartz (Silicon Dioxide - SiO2)
Magnetite / Iron Ore
Magnetite (Fe3O4)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Schist
Mica Schist
Blue Kyanite
Kyanite (Al2SiO5)
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Quartzite
Quartzite (Primary mineral: SiO2)
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
Quartz River Pebbles
Silicon Dioxide (SiO2)
Blue Kyanite
Kyanite (Al2SiO5)
Unakite
Epidotized Granite
Milky Quartz
Silicon Dioxide (SiO2)
Moss Agate
Moss Agate (a variety of Chalcedony, SiO ₂)
Quartzite
Quartzite (90%+ SiO2)
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Limonitic Quartzite
Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining
Quartzite River Rock
Quartzite (SiO2)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
Quartzite
Quartzite (primarily SiO2)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Quartzite (specifically a river-worn pebble)
Quartzite (primarily SiO2)
Fuchsite Gneiss (Green Quartzite)
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Phyllite
Phyllite (Foliated metamorphic rock)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Iron Oxide impurities
Quartz with Mica (likely Muscovite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride
Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
Greenstone (Epidisite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartzite Pebbles
Quartzite (primarily SiO2)
Quartzite
Quartzite (SiO2)
Yellow Quartzite or Yellow Jasper
Quartzite (primarily SiO2 with Iron oxide staining)
River Cobble (likely Quartzite)
Metamorphosed Sandstone (SiO2)
Green Calcite
Calcium Carbonate (CaCO3)