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1 item @ $40.00  

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.

Schoepite

#AH60502
Locality
Happy Jack mine, White Canyon, San Juan Co., Utah, United States 
Formula
(UO2)8O2(OH)12·12H2
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)12·12H2
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
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Schrockingerite

#BAC63194
Locality
Grand Co., Utah, United States 
Formula
NaCa3(UO2)(SO4)(CO3)3F·10H2
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·10H2
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!!

Sherwoodite

#BW63197
Locality
Sunday #2 mine, Slick Rock, San Miguel Co., Colorado, United States 
Formula
Ca4.5AlV14O40·28H2
Availability
Sold
Size
8 x 4.5 x 4 cm - Sm Cabinet 
Tagged
vanadium  

Bluish grey Sherwoodite in sandstone with brownish unknown.


Sherwoodite

Formula
Ca4.5AlV14O40·28H2
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
Collection
Bill Wilson Collection

Simplotite

on Coffinite - #BAC63183
Locality
Uravan Mineral Belt, Montrose Co., Valencia Co., New Mexico, United States 
Formula
CaV4+4O9·5H2
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.


Simplotite

Formula
CaV4+4O9·5H2
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Platy 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
greenish black, dark green, black 
Streak
brownish black 
Class
Monoclinic - Prismatic 
Hardness
Collection
William & Anne Cook Collection
SOLD
Steigerite - AH63163
Steigerite - AH63163

Steigerite

#AH63163
Locality
Cactus Rat mine, Grand Co., Utah, United States 
Formula
AlVO4·3H2
Availability
Sold
Size
7 x 2.5 x 0.5 cm - Sm Cabinet 
Tagged
vanadium  

Yellow spherulitic groups of platy crystals on sandstone. Collected by Arnold Hampson.


Steigerite

Formula
AlVO4·3H2
Crystal System
Monoclinic 
Crystal Habit
Pulverulent 
Luster
Waxy 
Color
canary yellow, olive green 
Streak
yellow 
Class
Monoclinic 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection

Steigerite

#AH63162
Locality
Cactus Rat mine, Grand Co., Utah, United States 
Formula
AlVO4·3H2
Availability
Sold
Size
3.5 x 3 x 0.7 cm - Miniature 
Tagged
vanadium  

Bright yellow to orange spherulitic groups of Steigerite.


Steigerite

Formula
AlVO4·3H2
Crystal System
Monoclinic 
Crystal Habit
Pulverulent 
Luster
Waxy 
Color
canary yellow, olive green 
Streak
yellow 
Class
Monoclinic 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection

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