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Rare and Fine Minerals

Friday, 03 August 2018 06:00 PM

Introducing the "Rare and Fine Minerals " gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including proustite, woodhouseite, and xenotime-(y) and more from places like Měděnec, Erzgebirge, Bohemia, Czech Republic, Champion mine, Mono Co., California, United States, and Bancroft, Ontario, Canada.

Proustite

on Arsenic - #RW48599
Locality
Měděnec, Erzgebirge, Bohemia, Czech Republic 
Formula
Ag3AsS3 
Availability
Available
Price
$325.00
Size
5.5 x 4 x 3.5 cm - Sm Cabinet 
Tagged
sulfide , silver  

Ruby red, prismatic crystals or Proustite to 3mm lining a vug filled with native, dull grey Arsenic and Arsenopyrite. Excellent specimen.


Proustite

Formula
Ag3AsS3 
Crystal System
Trigonal 
Crystal Habit
Massive, Crystalline - Poor, Blocky 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
vermilion, reddish gray 
Streak
vermilion red 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Sectile 
Hardness
2-2.5 
Collection
Robert J. Waidler Collection
Mineralpedia
View Proustite
On Dakota Matrix
Previously Sold Proustite
On Dakota Matrix
Other Available Proustite
WebMineral
View Proustite
Mindat
View Proustite

Woodhouseite

#BN49571
Locality
Champion mine, Mono Co., California, United States 
Formula
CaAl3(SO4)(PO4)(OH)6 
Availability
Available
Price
$75.00
Size
7 x 4.5 x 3 cm - Sm Cabinet 
Tagged
phosphate  
Special Info
Type Locality 

Creamy pink pseudocubic rhombohedral crystals to 5mm in Quartz matrix. The Champion mine is the type locality and can be said to have the finest crystals in the world. Although there are several other deposits, it is safe to say it is the best. It is found in a variety of geological environments such as copper porphyries with argillic alteration, hot springs, iron-tin, and carbonatites, cave-guano deposits but generally deposits of high aluminum such as the Champion mine. Interestingly not in pegmatites (?). 


Woodhouseite

Formula
CaAl3(SO4)(PO4)(OH)6 
Crystal System
Trigonal 
Crystal Habit
Pseudo Cubic, Tabular 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
colorless, white, pink, pale orange 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Hardness
4.5 
Collection
Dr. Buford Nichols Collection
Special Info
Type Locality

Xenotime-(Y)

with Euxenite - #PD33375
Locality
Bancroft, Ontario, Canada 
Formula
YPO4 
Availability
Sold
Size
10 x 8 x 4 cm - Cabinet 
Tagged
phosphate , pegmatite mineral  
Special Info
Radioactive!! 

This is a large, heavy specimen of pegmatite matrix. Euxenite is really the main mineral and occurs within the specimen as large crystal grains from 5mm to 18mm. They are dark brown with an vitreous luster. The Xenotime grains are 4-18mm and are kind of a yellowish brown replacing the Euxenite. The specimen originated from the Paul Moore collection with tag, though his name does not appear on the label. 

Because of the size, the specimen may cost extra to ship beyond the cart charge if shipped outside of the USA.


Xenotime-(Y)

Formula
YPO4 
Crystal System
Tetragonal 
Crystal Habit
Radial, Prismatic, Massive - Granular 
Cleavage
Perfect, None, None 
Luster
Vitreous - Greasy 
Color
yellowish brown, greenish brown, gray, reddish brown, brown 
Streak
white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Splintery 
Hardness
4-5 
Collection
Phillips Collection
Special Info
Radioactive!!

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