Polished brecciated jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely brecciated and iron-oxide-rich
mineral
Category
Metamorphic (Altered Igneous Rock)
Browse metamorphic (altered igneous rock) specimens identified by the Rock Identifier community.
Learn about Metamorphic (Altered Igneous Rock) in the encyclopedia
View all →
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Schist
Metamorphic Rock (Schist)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Brecciated quartz-rich rock, possibly silicified breccia
Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining
sedimentary
Tumbled orbicular jasper
Orbicular jasper (microcrystalline quartz/chalcedony with iron-bearing minerals)
metamorphic
Polished orange jasper
Microcrystalline quartz (SiO₂), commonly iron-oxide-rich chert/jasper
metamorphic
Polished serpentine (likely)
Serpentine-group minerals, chiefly antigorite and lizardite; commonly derived from altered peridotite
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Clear Quartz
Silicon dioxide (SiO2)
mineral
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
Oolitic Chert
Ooidal Microcrystalline Quartz (SiO2)
sedimentary
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Eclipse Stone (Kabamba Jasper)
Rhyolite with Aegirine (NaFe3+Si2O6)
metamorphic
Green Gneiss
Metamorphic Gneiss
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Small shell fragment (likely gastropod or bivalve fossil)
Fossilized calcium-carbonate shell; chiefly aragonite or calcite (CaCO₃)
fossil
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Aphanitic Igneous Rock
igneous
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Migmatite
Migmatite (Mixed Rock)
metamorphic
Greenschist (or Serpentinite with Manganese Dendrites)
Greenschist facies metamorphic rock
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orbicular jasper (ocean jasper)
Microcrystalline quartz (SiO₂), chiefly chalcedony with feldspar, zeolites, and iron-oxide inclusions
mineral
Unakite
Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relic olivine/pyroxene
metamorphic
Small rounded stone or mineral fragment
Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment
mineral