Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Category
Igneous, Sedimentary, And Metamorphic
Browse igneous, sedimentary, and metamorphic specimens identified by the Rock Identifier community.
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Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Mixed Gravel and Pebbles
Polylithic Alluvial Aggregate
igneous, sedimentary, and metamorphic mix
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Orange Calcite (likely polished specimen)
Calcite
Mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Quartz (Milky / Massive Quartz)
Silicon Dioxide (SiO2)
mineral
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Quartz-rich rock, possibly milky quartz or quartzite fragment
Quartz (SiO₂), potentially quartzite if metamorphic
mineral
Pyrite-bearing rock (likely pyrite-rich schist or massive pyrite)
Pyrite, FeS₂, possibly in a micaceous metamorphic matrix
mineral
Sandstone with Liesegang Rings
Quartzose Sandstone with Iron Oxide Precipitation
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Polished hematite bead (probable)
Hematite, Fe₂O₃
mineral
Weathered fine-grained stone, likely sandstone or quartzite
Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂
sedimentary
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Rounded gray stone, likely slate or fine-grained sandstone
Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing
sedimentary
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
mineral
Weathered quartz-rich rock fragment
Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing
mineral
Quartz-rich river pebble, likely milky quartz
Milky quartz (SiO₂), possibly a quartzite or quartz-rich silicate pebble
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Small quartz-rich mineral fragment
Quartz (SiO₂), possibly milky or chalcedonic quartz
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Mica
Mica group (often Muscovite or Biotite)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Pink-and-white banded quartzite or jasper
Quartzite, primarily microcrystalline SiO₂, possibly iron-stained quartz/chalcedony
metamorphic
Quartz-rich rock, possibly quartzite
Quartzite (dominantly quartz, SiO₂); identification is provisional from the photo
metamorphic
Possible shale or slate fragment
Fine-grained clay-rich rock; possibly slate (low-grade metamorphosed shale)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral