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Recently Released New Additions

Rare Minerals

Sunday, 16 April 2023 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including meurigite-k, nioboaeschynite-(ce), and whitlockite and more from places like Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany, Ilmeny Mts., South Urals, Russia, and Tip Top mine, Custer Co., South Dakota, United States.

Meurigite-K - BAC61506
Meurigite-K - BAC61506

Meurigite-K

#BAC61506
Locality
Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany 
Formula
[K(H2O)2.5][Fe3+8(PO4)6(OH)7]·4H2O 
Availability
Available
Price
$45.00
Size
2 x 1.5 x 1.6 cm - Thumbnail 
Tagged
phosphate  

Tiny radiating mustard yellow crystals in an area of 5 x 3mm enclosed in what looks like Rockbridgeite.


Meurigite-K

Formula
[K(H2O)2.5][Fe3+8(PO4)6(OH)7]·4H2O 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Spherical 
Cleavage
Good, None, None 
Luster
Silky 
Color
white, cream, yellowish brown, pale yellow, canary yellow 
Streak
pale yellowish white 
Class
Monoclinic - Prismatic 
Hardness
3 
Collection
William & Anne Cook Collection
Mineralpedia
View Meurigite-K
On Dakota Matrix
Previously Sold Meurigite-K
On Dakota Matrix
Other Available Meurigite-K
WebMineral
View Meurigite-K
Mindat
View Meurigite-K
SOLD
Nioboaeschynite-(Ce) - BAC61449
Nioboaeschynite-(Ce) - BAC61449

Nioboaeschynite-(Ce)

#BAC61449
Locality
Ilmeny Mts., South Urals, Russia 
Formula
(Ce,Ca)(Nb,Ti)2(O,OH)6 
Availability
Sold
Size
3 x 2 x 1.5 cm - Thumbnail 
Tagged
REE mineral , niobium  

A single 4mm yellowish brown crystal. Originally from the Fersman Mineralogical Museum specimen with label.


Nioboaeschynite-(Ce)

Formula
(Ce,Ca)(Nb,Ti)2(O,OH)6 
Crystal System
Orthorhombic 
Crystal Habit
Metamict 
Luster
Resinous 
Color
black 
Class
Orthorhombic - Dipyramidal 
Hardness
5.3-5.6 
Collection
William & Anne Cook Collection
Mineralpedia
View Nioboaeschynite-(Ce)
On Dakota Matrix
Previously Sold Nioboaeschynite-(Ce)
On Dakota Matrix
Other Available Nioboaeschynite-(Ce)
WebMineral
View Nioboaeschynite-(Ce)
Mindat
View Nioboaeschynite-(Ce)
SOLD
Whitlockite - 61452
Whitlockite - 61452

Whitlockite

#61452
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
Ca9Mg(PO4)6(PO3OH) 
Availability
Sold
Size
8 x 4 x 1.5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

This is an interesting specimen. There is nothing Earth-shaking about it, just abunch of of nice colors from the associated minerals: red from the Montgomeryite; purple from the Roscherite; and pink from the Whitlockite on light green gemmy Beryl. All of these minerals are covered with very tiny rhombs of Whitlockite. The only crystals are Whitlockite. Nontheless, it is fun to view under a microscope.


Whitlockite

Formula
Ca9Mg(PO4)6(PO3OH) 
Crystal System
Trigonal 
Crystal Habit
Rhombohedral Crystals, Tabular, Pistolitic 
Cleavage
None, None, None 
Luster
Vitreous - Resinous 
Color
colorless, gray, gray white, yellowish, white 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Uneven 
Hardness
5 
Mineralpedia
View Whitlockite
On Dakota Matrix
Previously Sold Whitlockite
On Dakota Matrix
Other Available Whitlockite
WebMineral
View Whitlockite
Mindat
View Whitlockite

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