Pyrite
Iron Disulfide (FeS2)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (varietal Flint)
Silicon Dioxide (SiO2)
sedimentary
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Quartz / Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Grey Chalcedony (Tumbled)
Chalcedony (SiO2)
mineral
Quartz (Milky or Common Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Chalcedony (Agate/Carnelian precursor)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Carnelian
Carnelian (Silica, SiO2)
mineral
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Botryoidal Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky or Rough Quartz)
Silicon Dioxide (SiO2)
mineral
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Chert (specifically Yellow/Tan Chert)
Silicon Dioxide (SiO2)
sedimentary
Red Quartz (Carnelian/Red Jasper Agate)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Agatized)
Silicon dioxide (SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Garnet in Schist (Polished Tower)
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Chert (specifically Flint or Common Opal)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Hematite/Limonite)
mineral
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Geodal Limestone / Calcite Druze
Calcium Carbonate (CaCO3)
sedimentary
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)
mineral
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Banded Agate (Pink Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral