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RM2564   Eucryptite, cookeite and quartz

Londonderry Li deposit, Nepean, Coolgardie Shire, Western Australia, Australia

In this specimen we can observe cookeite in pink tones. It is associated with eucryptite, a rare lithium aluminosilicate, and quartz. Eucriptite-quartz pseudomorphs were first discovered at this Australian mine in 1963, they are pale pink and, more rarely, dark glassy brown in color, and fluoresce reddish under shortwave ultraviolet light. Eucryptite is in the area indicated by the arrow.


Size: 6.4 x 4 x 3.6 cm.
Found in ±1978.

Col. J. Astor, Barcelona.
Fluorescent under short wave UV


 

RM2075   Dravite

Yinnietharra station, Yinnietharra, Upper Gascoyne Shire, Western Australia, Australia

Dravite crystals of Yinnietharra are a classic of the world mineralogy. Today, they can only be obtained from old collections that were fortunate enough to be formed when the mines were worked. This specimen shows us a group of doubly terminated dravite crystals, with very well defined faces and edges, bright and with the characteristic color of toasted honey. They are accompanied by muscovite.
Mining for muscovite used in the electrical industry occurred on Yinnietharra station at several sites between 1922 and 1946, beryl and columbite from 1942 to 1965, and gem specimen mining after this till around 1990. Minor rare earth, uranium bearing and lithium minerals are present but have never been mined to any extent. No mining on the field has been large scale.


Size: 5.8 x 4.6 x 4 cm.
Main crystal: 5.3 x 3.3 cm.
Found in ±1980.

Col. Manchion. #200. Expominer 1985.
Classic locality


 

RM1859   Malachite after azurite, hinsdalite and wulfenite

Whim Creek Copper Mine, Whim Creek, Roebourne Shire, Western Australia, Australia

Specimens from this Australian mine are unusual today. In this sample we have a group of azurite crystals pseudomorphized by malachite, preserving very well defined faces and edges. They are disposed on a goethite matrix partially coated with malachite, chrysocolla and small yellow crystals of wulfenite.


Size: 8.2 x 4.5 x 1.8 cm.
Main crystal: 18 x 17 mm.
Found in ±1985.

Col. J.M. Manchion, Barcelona. Nr. 190, 1985 Expominer.


 
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