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ASBESTIFORM MINERALS

  
NEW ACQUISITIONS


A.

B.

C.

D.

E.

F.

G.

H.

I.

J.

RIEBECKITE Var, Crocidolite

Mount Brockman, Hamersley Ranges, Pilbara Region, W.A., Australia

The 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. 

 

 

 

 

 


MI-1210

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

A.

1 1/8

5/8+

1/8

SOLD

B.

1 5/8

1/2

1/4

SOLD

C.

1 7/8

1

1/4

SOLD

D.

1 5/8

1 1/4

1 1/4

SOLD

E.

2 1/4

1 3/8

1 1/8

SOLD

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

SOLD

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

SOLD

M

2 7/8

2 5/8

1 1/2

SOLD

N.

3

3

1 3/4

SOLD

O.

2 3/8

2 1/4

1 7/8

$   65.00

P.

5

2 1/2

1 3/8

SOLD

Q.

3
 3 3/4

1 3/8
1 5/8

1 1/2
1 1/2

 SOLD

R.

5 3/8

4 3/8

2 3/4

SOLD

S.

 Lot of 3.0 grams consisting of several pure, golden to black fibrous Crocidolite
specimens, +/- 1” to 2” long.

$  11.00
/ lot






 


K.

L.

M.

N.

O.

.

P.

Q.

R.


2318
2319

2320

EDENITE
Palabora Mine, Loolekop, Phalaborwa, Limpopo Province, Republic of South Africa
The Edenite from this locality forms pure, silky white to very pale greenish white, elongated intergrowths composed of asbestiform fibers.  No matrix specimens are available.  Edenite is a member of the amphibole group of minerals.  Identification of Edenite from this newly reported occurrence was confirmed by XRD.
 

 

 

          

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

2318

2

1/8

1/8

$ 13.50

 

2319

2 1/8

1/4

1/8

$ 17.00

 

2320

3

1/8

1/8

$ 20.00


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. 

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