Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
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Mineral Health
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Botryoidal Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Pink Granite (Unakite-bearing or Epidote-bearing Granite)
Plutonic Igneous Rock (Granite)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Gneiss
Gneiss
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Gneiss
Gneiss
metamorphic
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Pebble with vesicles, likely basalt
Vesicular basalt; chiefly plagioclase, pyroxene, and iron-magnesium minerals
igneous
Serpentinite
Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; approximate formula Mg3Si2O5(OH)4
metamorphic
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (KAlSi3O8)
mineral
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Botryoidal Chalcedony / Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Feldspar
Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Metamorphic rock with large feldspar crystals (likely porphyroblastic gneiss)
Feldspar-porphyroblastic gneiss; likely quartz and feldspar with mica/amphibole, identification from image only
metamorphic
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Granite
Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)
igneous
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Small weathered fossil or mineral fragment
Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral
fossil
Schist
Schist (various mineral compositions)
Metamorphic
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Milky quartz (rough quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Unidentified metallic mineral or meteorite fragment
Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment
mineral
Serpentine (likely serpentinite)
Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly with magnetite and minor brucite
metamorphic
Tumbled quartz (likely milky or included quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled agate/chalcedony
Microcrystalline quartz (SiO₂), likely mossy or dendritic agate with iron-oxide inclusions
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Talc Schist / Soapstone
Talc (Mg3Si4O10(OH)2)
metamorphic
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral