ASBESTIFORM MINERALS
NEW ACQUISITIONS
ASBESTIFORM MINERALS
NEW ACQUISITIONS
 A.  B.  C.  D.  E.  F.  G.  H.  I.  J. |
RIEBECKITE Var, CrocidoliteMount Brockman, Hamersley Ranges, Pilbara Region, W.A., AustraliaThe Crocidolite locality at Mount Brockman is located
approximately 800 miles north of Perth, the capitol of Western Australia.
It occurs in the Marra Mamba Iron Formation, which has been age dated at ~
2.6 billion years. The color of the Crocidolite is basically black or
golden, usually with a very silky luster and excellent cross-fiber vein
structure. A very unusual feature of the specimens from this locality is
that thin veinlets of black Magnetite are sometimes associated. The
Magnetite veinlets can be seen as single diagonal veins running through the
Crocidolite (examples are items E. and K.) or bordering one of both edges of
the Crocidolite vein. Item G. has several small parallel Magnetite veinlets.
Item P. has two inverted, V-shaped Magnetite veinlets (one inside of the
other) on one end of the specimen. The Magnetite veinlets form a double
triangle shape that is 2” wide at the base, and 1 5/8” tall. This
triangular arrangement of Magnetite veins runs entirely through the specimen
(slightly diminished in size and definition on the back of the specimen).
Item Q. is a pair of specimens that exhibit a “mirror image” effect, with
both halves of the pair showing distinct zig-zagging of the Magnetite
veinlets running through the Crocidolite. Item R. has 3 inverted, V-shaped
Magnetite veinlets running through the Crocidolite. One is shown in the
center of the accompanying photo – a triangle 2 3/4” long at the base X 1
3/4” tall, and the other two are on the reverse side of the specimen. For a
size comparison, the weights of the three largest specimens are as follows:
P. = 599.50 grams (1.35 pounds), Q. = 467.00 grams (1.04 pounds), and R. =
2,200.00 grams (4.90 pounds). All of the Crocidolite specimens from Mt.
Brockman are exceptional in color, luster, and form.
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
SPECIMEN SIZE |
SPECIMEN |
||
|
A. |
1 1/8 |
5/8+ |
1/8 |
SOLD |
|
B. |
1 5/8 |
1/2 |
1/4 |
$ 12.50 |
|
C. |
1 7/8 |
1 |
1/4 |
SOLD |
|
D. |
1 5/8 |
1 1/4 |
1 1/4 |
$ 26.50 |
|
E. |
2 1/4 |
1 3/8 |
1 1/8 |
$ 28.50 |
|
F. |
1 7/8 |
1 5/8 |
1 1/4 |
$ 30.00 |
|
G. |
2 5/8 |
2 |
1 1/4 |
SOLD |
|
H. |
2 1/4 |
1 1/2 |
7/8 |
$ 38.50 |
|
I. |
1 7/8 |
1 1/2 |
1 1/4 |
$ 40.00 |
|
J. |
2 1/8 |
2 |
1 3/4 |
$ 45.00 |
|
K. |
2 3/8 |
1 7/8 |
7/8 |
$ 48.50 |
|
L. |
2 1/4 |
2 |
1 1/2 |
$ 48.50 |
|
M |
2 7/8 |
2 5/8 |
1 1/2 |
$ 65.00 |
|
N. |
3 |
3 |
1 3/4 |
$ 60.00 |
|
O. |
2 3/8 |
2 1/4 |
1 7/8 |
$ 65.00 |
|
P. |
5 |
2 1/2 |
1 3/8 |
SOLD |
|
Q. |
3 |
1 3/8 |
1 1/2 |
$ 85.00 |
|
R. |
5 3/8 |
4 3/8 |
2 3/4 |
$160.00 |
|
S. |
Lot of 3.0 grams consisting of
several pure, golden to black fibrous Crocidolite |
$ 11.00 |
||
 K. |
 L. |
 M. |
 N. |
 O. |
.  P. |
 Q. |
 R. |
 A.  B.  C.  D.  E.  F. |
EDENITE
|
||||||||||||||||||||||||||||||||||||||||
NOTES:
All specimens are natural, not processed in any way from their original form.
If you need other asbestiform minerals not described on this list please call,
FAX, or email and send us your list of requirements.
    |
Copyright 1998-2008 by Mineralogical Research Co.
All rights reserved.