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Colorado Plateau Minerals

Saturday, 13 January 2024 05:30 PM

The Colorado Plateau encompasses a large area of the southwest including Arizona, Colorado, New Mexico and Utah. Many of these minerals are formed in roll front uranium deposits. They can be bright yellow or orange and beautiful to see under the microscope.

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Schoepite

#AH60502

Details
Data
Provenance
Resources

Locality: Happy Jack mine, White Canyon, San Juan Co., Utah, United States
Formula: (UO₂)₈O₂(OH)₁₂·12H₂O
Availability: Sold
Size: 4 x 3.5 x 2.3 cm - Miniature
Special Info: Radioactive!!
Special Info: XRD Confirmed
Special Info: Raman

Bright yellowish orange glassy crystals on front and back. Collected by Arnold Hampson.

Schoepite

Formula: (UO₂)₈O₂(OH)₁₂·12H₂O
Crystal System: Orthorhombic
Cleavage: Perfect, Indistinct, None
Luster: Adamantine
Color: yellow, lemon yellow, brownish yellow, amber
Streak: light yellow
Class: Orthorhombic - Pyramidal
Fracture: Brittle
Hardness: 2.5

Collection: Arnold G Hampson Collection
Special Info: Radioactive!!
Special Info: XRD Confirmed
Special Info: Raman

Mineralpedia: View Schoepite
On Dakota Matrix: Previously Sold Schoepite
On Dakota Matrix: Other Available Schoepite
WebMineral: View Schoepite
Mindat: View Schoepite

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Schrockingerite

#BAC63194

Details
Data
Provenance
Resources

Locality: Grand Co., Utah, United States
Formula: NaCa₃(UO₂)(SO₄)(CO₃)₃F·10H₂O
Availability: Sold
Size: 5 x 3.5 x 3 cm - Miniature
Tagged: carbonate
Special Info: Poisonous!!

Glassy yellow thin plates, some showing terminations. The broadside of the crystals both lying flat and on end in a radial fashion. No specific mine is noted.

Schrockingerite

Formula: NaCa₃(UO₂)(SO₄)(CO₃)₃F·10H₂O
Crystal System: Orthorhombic
Crystal Habit: Globular, Aggregates
Cleavage: Perfect, None, None
Luster: Vitreous - Pearly
Color: yellow
Class: Orthorhombic - Dipyramidal
Hardness: 2.5

Collection: William & Anne Cook Collection
Special Info: Poisonous!!

Mineralpedia: View Schrockingerite
On Dakota Matrix: Previously Sold Schrockingerite
On Dakota Matrix: Other Available Schrockingerite
WebMineral: View Schrockingerite
Mindat: View Schrockingerite

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Sherwoodite

#BW63197

Details
Data
Provenance
Resources

Locality: Sunday #2 mine, Slick Rock, San Miguel Co., Colorado, United States
Formula: Ca_4.5AlV₁₄O₄₀·28H₂O
Availability: Sold
Size: 8 x 4.5 x 4 cm - Sm Cabinet
Tagged: vanadium

Bluish grey Sherwoodite in sandstone with brownish unknown.

Sherwoodite

Formula: Ca_4.5AlV₁₄O₄₀·28H₂O
Crystal System: Tetragonal
Cleavage: None, None, None
Luster: Vitreous - Dull
Color: blue green, yellow green, dark blue black
Streak: light blue
Class: Tetragonal - Ditetragonal Dipyramidal
Fracture: Conchoidal - Uneven
Hardness: 2

Collection: Bill Wilson Collection

On Dakota Matrix: Previously Sold Sherwoodite
On Dakota Matrix: Other Available Sherwoodite
WebMineral: View Sherwoodite
Mindat: View Sherwoodite

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Simplotite

on Coffinite - #BAC63183

Details
Data
Provenance
Resources

Locality: Uravan Mineral Belt, Montrose Co., Valencia Co., New Mexico, United States
Formula: CaV⁴⁺₄O₉·5H₂O
Availability: Sold
Size: 3.5 x 2.5 x 1.3 cm - Miniature
Tagged: vanadium

Golden brown, very thin plates of Simplotite along one of the edges of this specimen. These crystals look a lot like Sincosite crystals, and it's no wonder why as the composition is nearly the same. Sincosite's formula is Ca(VO)₂(PO₄)₂ · 5H₂O, which is similar to Simplotite, although the crystal systems are different. Simplotite is monoclinc whereas Sincosite is tetragonal. Sincosite can also occur as golden brown crystals, just like this specimen. These are just my observations and probably has no basis as to why they look alike.