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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 harmotome and more from places like St. Andreasberg dist., Harz, Lower Saxony, Germany.

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
View Harmotome
On Dakota Matrix
Previously Sold Harmotome
On Dakota Matrix
Other Available Harmotome
WebMineral
View Harmotome
Mindat
View Harmotome

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