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Big & Rush Creeks MIneral Specimens

Saturday, 27 June 2015 01:00 PM

Barium Silicate Minerals

Macdonaldite

#PD42220
Locality
Big Creek, Fresno Co., California, United States 
Formula
BaCa4Si16O36(OH)2·10H2
Availability
Sold
Size
4.5 x 4 x 2 cm - Miniature 
Special Info
Type Locality 

Excellent coverage of rare Macdonaldite in acicular radial sprays to 2mm over altered Sanbornite matrix. It is associated with tiny crystal grains of Fresnoite. Outside of the metasomatized barium deposits of California, there is only one other world locality for Macdonaldite.


Macdonaldite

Formula
BaCa4Si16O36(OH)2·10H2
Crystal System
Orthorhombic 
Crystal Habit
Acicular 
Cleavage
Perfect, Good, Indistinct 
Luster
Vitreous - Silky 
Color
colorless, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
3.5-4 
Collection
Phillips Collection
Special Info
Type Locality

Macdonaldite

with Sanbornite - #PD42221
Locality
Big Creek, Fresno Co., California, United States 
Formula
BaCa4Si16O36(OH)2·10H2
Availability
Sold
Size
3 x 1.5 x 1.5 cm - Thumbnail 
Special Info
Type Locality 

An excellent specimen with radial sprays of colorless to white acicular crystals to 1-2mm. The crystals are free-standing. Macdonaldite is an alteration product of Sanbornite but is rare. This is one of the better specimens in this Special Edition.


Macdonaldite

Formula
BaCa4Si16O36(OH)2·10H2
Crystal System
Orthorhombic 
Crystal Habit
Acicular 
Cleavage
Perfect, Good, Indistinct 
Luster
Vitreous - Silky 
Color
colorless, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
3.5-4 
Collection
Phillips Collection
Special Info
Type Locality

Muirite

with Sanbornite & Pyrrhotite - #42224
Locality
Esquire #7 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Availability
Sold
Size
4 x 4 x 2.5 cm - Miniature 
Special Info
Type Locality 

Light orange crystalline grains less than 0.75mm in Sanbornite matrix with Pyrrhotite. Muirite is an extremely rare mineral at these deposits and typically occurs as isolated grains sometimes with a little crystal form. It is not fluorescent. It is named after John Muir. Please see Walstrom and Leising for more information.


Muirite

Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Crystal System
Tetragonal 
Crystal Habit
Anhedral Grains 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
orange, brown 
Streak
light orange 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
2.5 
Collection
Phillips Collection
Special Info
Type Locality
Mineralpedia
View Muirite
On Dakota Matrix
Previously Sold Muirite
On Dakota Matrix
Other Available Muirite
WebMineral
View Muirite
Mindat
View Muirite

Muirite

with Sanbornite & Pyrrhotite - #AK42226
Locality
Esquire #7 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Availability
Sold
Size
4 x 3 x 3 cm - Miniature 
Special Info
Type Locality 

This is a good, rich specimen with light to dark orange grains and veinlets of Muirite. The anhedral crystalline grains reach about 1mm. Associate minerals include Sanbornite and Pyrrhotite. Muirite is an extremely rare mineral and found in only a few places worldwide.

This is the type locality for the mineral named in honor of the famous John Muir, geologist and explorer. Kidwell obtained this specimen from Army Colonel Clarence Marvin Jenni (Jennite). Colonel Jenni is referenced on the backside of his label (see prov. tab) in 1965.


Muirite

Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Crystal System
Tetragonal 
Crystal Habit
Anhedral Grains 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
orange, brown 
Streak
light orange 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
2.5 
Special Info
Type Locality
Mineralpedia
View Muirite
On Dakota Matrix
Previously Sold Muirite
On Dakota Matrix
Other Available Muirite
WebMineral
View Muirite
Mindat
View Muirite

Muirite

with Sanbornite & Pyrrhotite - #42227
Locality
Esquire #7 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Availability
Sold
Size
3.5 x 3.5 x 2.5 cm - Miniature 
Special Info
Type Locality 

Scattered orange, anhedral grains in Sanbornite rich matrix. This is a fairly rich specimen exhibiting typical Muirite from these deposits.


Muirite

Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Crystal System
Tetragonal 
Crystal Habit
Anhedral Grains 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
orange, brown 
Streak
light orange 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
2.5 
Special Info
Type Locality
Mineralpedia
View Muirite
On Dakota Matrix
Previously Sold Muirite
On Dakota Matrix
Other Available Muirite
WebMineral
View Muirite
Mindat
View Muirite

Muirite

with Sanbornite & Pyrrhotite - #42228
Locality
Esquire #7 claim, Big Creek, Fresno Co., California, United States 
Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Availability
Sold
Size
3 x 2.5 x 1.5 cm - Thumbnail 
Special Info
Type Locality 

Rich orange, anhedral grains less than 1mm scattered throughout sanbornite rich matrix with Pyrrhotite.


Muirite

Formula
Ba10Ca2Mn2+TiSi10O30(OH)10 
Crystal System
Tetragonal 
Crystal Habit
Anhedral Grains 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
orange, brown 
Streak
light orange 
Class
Tetragonal - Ditetragonal Dipyramidal 
Hardness
2.5 
Special Info
Type Locality
Mineralpedia
View Muirite
On Dakota Matrix
Previously Sold Muirite
On Dakota Matrix
Other Available Muirite
WebMineral
View Muirite
Mindat
View Muirite

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