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MINERAL SPECIMENS FOR DISPLAY

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DIAMOND
Premier Mine, Transvaal, Republic of South Africa

This octahedral crystal specimen was selected for its interesting form, as well as its external sharpness.  Obviously, if it was of gem quality we could not offer it for such a low price per carat.  Large size natural Diamond crystals are seldom available on the market for mineral collectors, so this is an excellent opportunity to add one of these native elements, in crystal form, to your mineral collection.  Sharp, well-developed faces are present on all faces of the crystal.  The specimen is fluorescent weak blue-white under SW UV, and medium blue-white under LW.  No phosphorescence was noted.  For background information on Diamonds from the Premier Mine, see the Jan-Feb 2004 issue of the “Mineralogical Record” magazine, P. 24-25 (Diamonds & Gold special issue).

Specimen number: 2408
Carat weight: 5.40 carats
Specimen size: 11.0 X 10.5 X 10.5 mm
Clarity / color: Translucent, colorless, with minor micro carbon inclusions and internal imperfections.
Crystal form: Sharp octahedron exhibiting multiple complex trigonal faces
Price / carat: $   250.
Specimen price: $1,350.




DIAMOND
Miba Mine, Mbuji Mayi (Bakwanga), Kasaï-Oriental, Democratic Republic of Congo (Zaire)

This lustrous, translucent-opaque, off-white color natural Diamond crystal has a complex cubic crystal habit with many sharp micro octahedral crystal faces.  Internally, the crystal is imperfect, with no dark inclusions.  No damage.  UV fluorescence: very weak tan, LW only.

Specimen number: 2452
Carat weight: 8.25 carats
Specimen size: 11.0 X 10.5 X 9.5 mm
Clarity / color: Translucent-opaque, colorless, no dark inclusions.
Crystal form: Complex multi-faced cubic crystal intergrowth with numerous micro octahedral faces.
Price / carat: $   200.
Specimen price: $1,650.


A.

B.

C.

 

STIBNITE
Baia Sprie (Felsobanya), Maramures, Romania
Three specimens are available, as detailed in the accompanying table.  The A. specimen is a three-dimensional crystal cluster without matrix.  Item B. is a matrix-free crystal group with more than 100 upright, terminated crystals.  The base of the specimen is flat, and is completely covered with intergrown, prismatic, terminated crystals (no matrix).  Specimen C. is a V-shaped intergrowth composed of two large crystals, associated with many micro Stibnite xl. sprays, without matrix.  All three specimens are from the F. Marhsall collection, mined circa the early 1980’s.

 

 MI-1213

 

SPECIMEN SIZE
(INCHES)

LENGTH OF LARGEST XL.

NO. OF XLS. PRESENT

SPECIMEN
PRICE

A.

2 1/2”

1 1/2”

7/8”

7/8”

more than 50

$  90.00

B.

2 1/2”

2 1/4”

7/8”

7/8”

more than 100

$125.00

C.

3 1/4”

1 1/2”

7/8”

3”

2  large xls., plus many hundreds of micro xls.

SOLD

SILVER (native) with ERYTHRITE
Cobalt District, Coleman Township, Ontario, Canada
A fairly hefty sheet of leaf Silver is associated with small amounts of pale pink massive Erythrite, and black massive Smaltite.  No rock matrix.  From the collection of W. Scott Lewis of Hollywood, California.
Specimen size:  2 1/8” X 1 3/8” across, X up to 1/4” thick
Weight:  33.12 grams
Order Item MI-1216
Price:  $50.


A.

B.

DRAVITE TOURMALINE
Yinnietharra, W.A., Australia
There are actually two colors of crystallized Dravite from the Yinnietharra deposit – brown, and black.  For many years it was thought that the black crystals were Schorl, and that the brown, equantly developed crystals were Dravite.  Researchers reported in the “Mineralogical Record”, March-April 1977, P. 104-107 that both the brown and black crystals from this deposit are indeed ferroan Dravite.  The two specimens available here are from the F. Marshall collection.  Each is an equantly developed, double terminated single crystal without matrix.   The brown Dravite crystals from Yinnietharra  were formed within a Phlogopite-Plagioclase schist and, typical of the occurrence, they have tiny bits of Phlogopite attached to some of the crystal faces.  In some places the development of the crystal faces was hampered by the presence of Phlogopite.  This can be seen on the specimens as rough areas where small bits of Phlogopite are present, adhering to the Dravite crystal faces, or where small amounts of the crystal faces are not present where the crystals grew up against the Phlogopite.

MI-1164

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

A. 

1 1/8

1

1

$30.00

B.

1 1/2

1 3/8

1

$40.00

 

 

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