Concretion
Septarian Concretion (Clay-Ironstone Nodules)
sedimentary
Category
Mineral Within A Sedimentary Rock
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Septarian Nodule
Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)
sedimentary
Ferruginous Sandstone
Iron-rich Clastic Sedimentary Rock
sedimentary
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz-bearing granite or pegmatite fragment
Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende
igneous
Gneiss
Gneiss
metamorphic
Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
sedimentary
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Hydroxide impurities
mineral
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion
Siderite / Hematite-bearing Sedimentary Rock
sedimentary
Weathered sandstone or limestone fragment
Likely quartz-rich sandstone; possibly calcarenite or weathered limestone
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Jasper/Quartzite variant)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Dark mineral nodule with white veining
Possibly a calcite-veined manganese- or iron-rich concretion; exact identification requires testing
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary