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Various Minerals

Thursday, 31 January 2013 08:00 AM

Introducing the "Various Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including bastnasite-(ce), datolite, and harmotome and more from places like Zegi Mountain, Khber Agency, FATA, Pakistan, Dal'negorsk, Primorsky Kray, Russia, and St. Andreasberg dist., Harz, Lower Saxony, Germany.

Bastnasite-(Ce)

#25267
Locality
Zegi Mountain, Khber Agency, FATA, Pakistan 
Formula
CeCO3
Availability
Available
Price
$250.00
Size
2 x 1 x 1 cm - Thumbnail 
Tagged
carbonate , REE mineral  

Perfect hexagonal Bastnaesite-Ce crystal with one good pinnacoidal termination with a slight first order pyramidal modification. This crystal is a nice brown-orange color with a good glassy luster. The Zegi Mountains in Pakistan have produced the largest and nicest Bastnaesite-Ce crystals.


Bastnasite-(Ce)

Formula
CeCO3
Crystal System
Hexagonal 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Imperfect, Indistinct, None 
Luster
Vitreous - Greasy 
Color
yellow, reddish brown 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Fracture
Uneven 
Hardness
4-5 

Datolite

#29306
Locality
Dal'negorsk, Primorsky Kray, Russia 
Formula
CaBSiO4(OH) 
Availability
Available
Price
$250.00
Size
6 x 4.5 x 3 cm - Sm Cabinet 

Much better in person, this specimen has lime green, glassy crystals to 2.3cm. No damage, nice piece.


Datolite

Formula
CaBSiO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Granular, Porcelainous 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, yellow, white, light green 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
5.5 
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Harmotome

on Calcite - #PD33000
Locality
St. Andreasberg dist., Harz, Lower Saxony, Germany 
Formula
Ba2(Si12Al4)O32·12H2
Availability
Available
Price
$325.00
Size
6 x 4 x 4 cm - Sm Cabinet 
Special Info
Antique Specimen 
Special Info
Type Locality 

Old specimen with old label from the collection of G. Emery and a date of 1921. See prov. tab. The label number matches the specimen number.

The specimen consist of white to colorless "cross" twinned prismatic crystals. As near as I can tell, and based upon Rudy Tschernich's crystal drawing in his book "Zeolites of the World" these are cruciform perier twins. Emery, on the back side of his label drew the crystals and comes close to the real thing. The crystals are about 3 to 6mm.


Harmotome

Formula
Ba2(Si12Al4)O32·12H2
Crystal System
Monoclinic 
Crystal Habit
Twinning Common, Cruciform, Striated 
Cleavage
Good, Fair, None 
Luster
Vitreous (Glassy) 
Color
white, gray, yellow, red, brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
4-5 
Collection
Phillips Collection
Special Info
Antique Specimen
Special Info
Type Locality
Mineralpedia
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