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0 item @ $0.00  

Big & Rush Creeks MIneral Specimens

Saturday, 27 June 2015 01:00 PM

Barium Silicate Minerals

SOLD
Pellyite - 42231
Pellyite - 42231

Pellyite

with Muirite - #42231
Locality
Esquire #8 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba2CaFe2+2Si6O17 
Availability
Sold
Size
4 x 3 x 1.5 cm - Miniature 

A 15x14cm area of crystalline, glassy brown Pellyite in Sanbornite rich matrix. Pellyite is an extremely rare mineral according to Robert Walstrom. There are several grains of less than 1mm Muirite scattered within the matrix. Both minerals are rich in barium as is Sanbornite. Pellyite is not fluorescent and resembles smoky quartz. It rarely forms crystals at Big Creek - Rush Creek deposits. It forms in contact metamorphic deposits.


Pellyite

Formula
Ba2CaFe2+2Si6O17 
Crystal System
Orthorhombic 
Crystal Habit
Massive 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, light yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Mineralpedia
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Pellyite

with Gillespite - #42233
Locality
Esquire #8 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba2CaFe2+2Si6O17 
Availability
Sold
Size
4 x 3 x 2.5 cm - Miniature 

This specimen has an excellent 4mm thick vein of Pellyite (orange arrow). It is a glassy brown and not fluorescent and occurs with spotty red Gillespite. There are a few grains of Fresnoite (blue arrow)  and the matrix is Sanbornite rich.


Pellyite

Formula
Ba2CaFe2+2Si6O17 
Crystal System
Orthorhombic 
Crystal Habit
Massive 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, light yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Mineralpedia
View Pellyite
On Dakota Matrix
Previously Sold Pellyite
On Dakota Matrix
Other Available Pellyite
WebMineral
View Pellyite
Mindat
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Pyrrhotite

with Titantaramellite - #PD42239
Locality
Esquire #7 claim, Big Creek, Fresno Co., California, United States 
Formula
Fe7S8 
Availability
Sold
Size
6 x 4.5 x 3 cm - Sm Cabinet 
Tagged
sulfide  

Brassy metallic anhedral Pyrrhotite crystal grains from 1 to 5mm with minor tabular deep reddish brown Titantaramellite.


Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Phillips Collection

Sanbornite

#PD42241
Locality
Rush Creek, Fresno Co., California, United States 
Formula
BaSi2O5 
Availability
Sold
Size
5 x 5 x 1.2 cm - Miniature 

A thick cleavage plate of light green Sanbornite. Sanbornite is the most abundant barium silicate at these deposits. The mineral has one perfect cleavage and a specific density of 3.7. According to Walstrom and Leising the largest masses recovered was 20cm with a thickness of 8cm. This specimen is originally from the Carlton Davis collection.


Sanbornite

Formula
BaSi2O5 
Crystal System
Orthorhombic 
Crystal Habit
Platy 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
Phillips Collection
SOLD
Taramellite - PD42244
Taramellite - PD42244

Taramellite

#PD42244
Locality
Big Creek, Fresno Co., California, United States 
Formula
Ba4(Fe3+,Ti)4O2[B2Si8O27]Cl0-1 
Availability
Sold
Size
5.5 x 3 x 2 cm - Sm Cabinet 

A 2mm deep reddish brown crystal embedded in Sanbornite-Quartz matrix. I am not sure about the identity, thus no return. It seems different than Titantaramellite in both color and shape but may be Titantaramellite. It is an old Carlton Davis specimen.


Taramellite

Formula
Ba4(Fe3+,Ti)4O2[B2Si8O27]Cl0-1 
Crystal System
Orthorhombic 
Crystal Habit
Fibrous 
Cleavage
Perfect, None, None 
Luster
Vitreous - Resinous 
Color
reddish brown, bronze purple, brownish violet 
Streak
brown 
Class
Orthorhombic - Dipyramidal 
Hardness
5.5 
Collection
Phillips Collection

Titantaramellite

with Sanbornite - #PD42247
Locality
Esquire #8 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba4(Ti,Fe3+,Mg)4(O,OH)2[B2Si8O27]Clx 
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 

Numerous well-formed bladed or tabular crystals of deep reddish brown Titantaramellite to 4mm. Excellent specimen.


Titantaramellite

Formula
Ba4(Ti,Fe3+,Mg)4(O,OH)2[B2Si8O27]Clx 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Anhedral Grains 
Cleavage
Perfect, None, None 
Color
bronze brown, purple red 
Class
Orthorhombic - Dipyramidal 
Hardness
5.5-6 
Collection
Phillips Collection

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