Pyrite
Iron Sulfide (FeS2)
mineral
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy / Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Vein Quartz in Host Rock
Silicon Dioxide (SiO2) vein in sedimentary/metamorphic matrix
mineral
Quartz Sand Grain
Silicon dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Peach/Orange)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Optical Calcite
CaCO3 (Calcium Carbonate)
mineral
Pyrite-bearing rock (likely pyrite-rich schist or quartz-bearing sulfide ore)
Pyrite (FeS₂) in a rock matrix; exact host rock cannot be confirmed from the photo
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode Cluster (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Possible calcite crystal fragment
Calcite (CaCO₃), tentative identification
mineral
Blue Apatite
Calcium phosphate fluorapatite, Ca5(PO4)3(F,Cl,OH)
mineral
Flint
Microcrystalline quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pyrite-bearing Rock / Pyrite Ore
Iron Sulfide (FeS2) in host rock matrix
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Sedimentary Rock
Sedimentary rock (lithified sediment)
sedimentary
Limestone and Sandstone Assortment
Sedimentary Rock Assemblage
sedimentary
Banded Onyx (Green Onyx)
Banded Calcite or Travertine (CaCO3)
Sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Banded iron formation (ironstone)
BIF; alternating hematite/magnetite and chert (SiO₂) layers
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
mineral
Chert
Silicon dioxide (SiO2)
sedimentary
Chert or Flint
Silicon dioxide (SiO2)
sedimentary
Banded iron formation fragment (likely hematite–magnetite ironstone)
BIF; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica as microcrystalline quartz (SiO₂)
sedimentary
Mica
Phyllosilicate group (e.g., Biotite or Muscovite)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Blue apatite (likely dyed or enhanced)
Apatite group; fluorapatite, Ca5(PO4)3F, is the common blue variety
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
Mineral