Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
Learn about Sedimentary And Igneous (Mixed) in the encyclopedia
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Grey River Pebble (Greywacke / Basalt)
Stream-rounded silicate rock pebble
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)
sedimentary
Banded Gneiss
Banded Orthogneiss or Paragneiss (Quartz-Feldspathic Gneiss)
metamorphic
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Fine-grained gray sandstone or quartz-rich sedimentary pebble
Likely quartz arenite or lithic sandstone; exact identification requires microscopy or testing
sedimentary
Magnetite-rich ironstone (probable magnetite ore)
Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix
mineral
Red Quartz (Carnelian/Red Jasper Agate)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Banded Sandstone (Water-worn Pebble)
Arenite with mineral banding
sedimentary
Basalt pebble
Aphanitic Mafic Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Bumblebee Jasper
Calcite with Arsenic and Manganese oxides (technically a volcanic rock)
igneous
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Bloodstone Jasper (Heliotrope)
SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz
sedimentary
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing
metamorphic
Likely quartz crystal fragment
Quartz (SiO₂), possibly a small tumbled or cleaved fragment
mineral
Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety
mineral
Garnet-bearing gneiss
Quartz–feldspar–mica gneiss with iron-rich garnet (commonly almandine)
metamorphic
Hematite
Hematite (Fe2O3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Metamorphic Rock (Quartz, Potassium Feldspar, Plagioclase, Biotite/Amphibole)
metamorphic
Agate (specifically crazy lace agate / orbicular agate node)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Gneiss
Gneiss
metamorphic
Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral