Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Basalt with Quartz/Feldspar Inclusion
Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)
igneous
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Chert (Yellow variety / Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Aphanitic mafic volcanic rock)
igneous
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Porphyritic Basalt (with Quartz or Calcite inclusion)
Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)
igneous
Green Tourmaline
Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Chert (often called Flint)
Chert (SiO2)
sedimentary
Chert
Chert (microcrystalline quartz)
Sedimentary
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Brown Agate
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint)
Chert (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Amygdaloidal Basalt with Quartz/Zeolite Infill
Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)
igneous
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Granitoid (Granite/Diorite)
Course-grained Plutonic Igneous Rock
igneous
Chert (Iron-stained)
Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)
sedimentary
Banded Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Banded Iron Formation / Jasper-Hematite Ore
Banded Iron Formation (BIF) containing Jasper (SiO2) and Hematite (Fe2O3)
sedimentary
Banded Iron Formation (Red Jasper and Hematite Chert)
Banded Iron Formation (BIF); Fe2O3 (Hematite) + SiO2 (Quartz/Jasper)
sedimentary