Iron-stained granitic or volcanic rock
Probable weathered granite/granodiorite with iron-oxide alteration; exact identification requires testing
igneous
Category
Mineral On Igneous Rock
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Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Weathered granite pebble
Granite, a coarse-grained felsic plutonic rock composed mainly of quartz, feldspar, and mica
igneous
Granite or Pegmatite in host rock
Granitoid / Felsic Intrusive Rock
Igneous
Granite
Granite (a plutonic rock)
Igneous
Pumice or vesicular volcanic rock
Pumice; predominantly volcanic glass (silica-rich, commonly rhyolitic to dacitic)
igneous
K-Feldspar Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Basalt
Aphanitic Mafic Igneous Rock
igneous
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Unidentified gray rock/mineral specimen
Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen
mineral
Clear quartz crystal (likely quartz point or polished quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Spinifex Texture Komatiite
Komatiite (Ultramafic Volcanic Rock)
igneous
Diorite (possibly Orbicular Diorite or Porphyritic Diorite)
Intermediate Phaneritic Igneous Rock
igneous
Polished operculum (“Shiva eye” shell)
Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Sodalite
Na8Al6Si6O24(Cl,OH)2
mineral
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Granite
Granite; chiefly quartz, feldspar, and mica or amphibole
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Carnelian Agate
Chalcedony (SiO2)
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Basalt Outcropping
Aphanitic Mafic Igneous Rock
igneous
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Pegmatite
Igneous Pegmatite
igneous
Coarse-grained granite (possibly granodiorite)
Granite, composed chiefly of quartz, feldspar, and mica; exact mineral proportions cannot be confirmed from the photograph.
igneous
Likely weathered igneous rock fragments
Indeterminate; possibly basaltic or granitic rock with quartz, feldspar, and dark mafic minerals
igneous
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Granite
Intrusive igneous felsic rock
igneous
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Likely garnet (rough crystal)
Garnet group; possibly almandine, (Fe₃Al₂(SiO₄)₃)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Copper-bearing porphyritic rock (likely bornite/chalcopyrite ore)
Altered porphyritic volcanic rock with copper sulfides, chiefly bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂)
igneous
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic