Limonite with Quartz
Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)
mineral
Category
Minerals
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Limonite
FeO(OH)•nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Rounded granite pebble
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Banded gneiss boulder
Gneiss; composition likely quartz, feldspar, and mica
metamorphic
Likely blue mineral or tumbled stone
Unidentified; the image is too blurry for reliable identification
mineral
Blue-green mineral specimen, possibly turquoise
Uncertain from the image; turquoise is hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Limonite Concretion
Goethite-rich Concretion (FeO(OH))
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Native Sulfur
Sulfur (S)
mineral
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Gneiss
Banded Gneiss
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Diorite
Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)
igneous
Polished basalt pebble
Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase, pyroxene, olivine, and iron oxides
igneous
Granite
Granite
igneous
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Milky quartz with dark mineral inclusions
Quartz, SiO₂; dark inclusions are not identifiable from the image
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Glaucophane-bearing Schist (Blueschist)
Blueschist (Glaucophane-Lawsonite Schist)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Mica schist (likely biotite–muscovite schist)
Mica schist; chiefly quartz and mica minerals (muscovite KAl₂(AlSi₃O₁₀)(OH)₂ and/or biotite)
metamorphic
Pegmatitic mica-rich granite
Granitic pegmatite, composed mainly of quartz, feldspar, and biotite/muscovite mica
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Yellow Ochre
Limonite/Goethite clay mixture, FeO(OH)·nH2O
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite pebble
Granite, composed mainly of quartz, feldspar, and dark mica (biotite)
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz (Tumbled)
SiO2 (Silicon Dioxide)
mineral
Quartz (Citrine or Iron-Stained)
SiO2
mineral
Geode Nodule Fragment
Quartz / Chalcedony Nodule
sedimentary
Quartz with Sulfides
Silicon Dioxide (SiO2) with accessory minerals
mineral
K-Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Limonite Concretion
FeO(OH)·nH2O
mineral
White Howlite
Howlite, Ca2B5SiO9(OH)5
mineral