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Big & Rush Creeks MIneral Specimens

Saturday, 27 June 2015 01:00 PM

Barium Silicate Minerals

Anandite

#42260
Locality
Esquire #7 claim, Big Creek, Fresno Co., California, United States 
Formula
BaFe2+3(Si3Fe3+)O10S(OH) 
Availability
Sold
Size
2.5 x 1.5 x 1 cm - Thumbnail 

Anandite is a barium member of the mica group shown here as black micaceous cleavages with red Gillespite.


Anandite

Formula
BaFe2+3(Si3Fe3+)O10S(OH) 
Crystal System
Monoclinic 
Crystal Habit
Massive 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
black 
Streak
gray white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
3-4 
Collection
Phillips Collection
On Dakota Matrix
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Baryte

#PD42261
Locality
Rush Creek, Fresno Co., California, United States 
Formula
BaSO4 
Availability
Sold
Size
6 x 5 x 2.5 cm - Sm Cabinet 

Yes, there is Baryte at these deposits although rare. This specimen includes numerous 1-4mm chisel-shaped, tabular crystals.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Phillips Collection
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Bazirite

with Taramellite - #PD42262
Locality
Big Creek, Fresno Co., California, United States 
Formula
BaZrSi3O9 
Availability
Sold
Size
3.5 x 3 x 2.5 cm - Miniature 

Pretty good coverage of fluorescent Bazirite seen as bright blue crystals under UV in matrix. There are several tabular Taramellite(?) crystals which reach 15mm.


Bazirite

Formula
BaZrSi3O9 
Crystal System
Hexagonal 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Hardness
6-6.5 
Collection
Phillips Collection
On Dakota Matrix
Previously Sold Bazirite
On Dakota Matrix
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Bazirite

#AK42263
Locality
Big Creek, Fresno Co., California, United States 
Formula
BaZrSi3O9 
Availability
Sold
Size
3.5 x 2.5 x 1.5 cm - Miniature 
Special Info
Fluorescent 

Bazirite is rare mineral worldwide but according to Walstrom is common at these deposits. As you can see in the photos it is intensely fluorescent bright blue. Fluorescence is about the only way to ID visually this mineral from Big Creek. This specimen contains numerous crystals to less than 0.5mm.


Bazirite

Formula
BaZrSi3O9 
Crystal System
Hexagonal 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Hardness
6-6.5 
Collection
Kidwell Collection
Special Info
Fluorescent
On Dakota Matrix
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Celsian - PD42265
Celsian - PD42265

Celsian

#PD42265
Locality
Esquire #8 claim, Big Creek, Fresno Co., California, United States 
Formula
BaAl2Si2O8 
Availability
Sold
Size
4 x 4 x 3.5 cm - Miniature 

White granular or sugary mass of Celsian. Celsian is a rather uncommon barium feldspar but common at Big Creek.


Celsian

Formula
BaAl2Si2O8 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Crystalline - Fine 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellow, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
6-6.5 
Collection
Phillips Collection
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Devitoite

with Celsian & Titantaramellite - #39231
Locality
Esquire #8 claim, Big Creek, Fresno Co., California, United States 
Formula
[Ba6(PO4)2(CO3)][Fe2+7Fe3+2(SiO3)8O2(OH)4
Availability
Sold
Size
2.5 x 2 x 2 cm - Thumbnail 
Tagged
phosphate , carbonate  
Special Info
Type Locality 

Deep reddish brown rosettes embedded in matrix to 2mm. It is associated with Celsian, Bazirite, and Titantaramellite. The label is signed by Robert Walstrom, the discoverer.


Devitoite

Formula
[Ba6(PO4)2(CO3)][Fe2+7Fe3+2(SiO3)8O2(OH)4
Special Info
Type Locality
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