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ASBESTIFORM MINERALS

  
NEW ACQUISITIONS


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CARLOSTURANITE
Val Varaita, near Sempeyre, Piedmont, Italy (type locale)
Carlosturanite is a fairly recently described member of the Amphibole group, first found at this locality in 1991.  Its habit is asbestiform, with flexible fibers found in some specimens up to several centimeters in length.  Color is light brown, with a vitreous luster.  Chemical composition is (Mg,Fe,Ti,Mn,Cr)21(Si,Al)12O28(OH)34.H2O.  

 

 

Type 1 – Aggregates of pure asbestiform / fibrous, light tan color Carlosturanite without matrix.

 

 

MI-1188
TYPE 1

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

1 A.

1 1/2

1/2

3/8

$ 14.50

 

1 B.

1 5/8

5/8

1/4

SOLD

 

1 C.

4 1/8

3/4

3/8

SOLD

 

1 D.

4 1/8

1

5/8

$ 40.00

 

1 E.

 Lot of long, hair-like fibers without matrix, in a plastic bag.  Fibers are up to 2”  long, @

     $  8.00/lot 



 

Type 2 – Same as above, aggregates of pure asbestiform / fibrous, light tan color Carlosturanite with rock matrix.  Due to the long, fibrous nature of this new mineral, matrix specimens are apparently more difficult to recover than examples without matrix.

 

 

MI-1188
TYPE 2

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

2 F.

1 3/8

5/8

5/8

$ 18.50

 

2 G.

1 1/2

7/8

3/8

$ 22.50

 

2 H.

1 3/4

1

3/8

$ 12.50

 

2 I.

1 7/8

1 3/4

1 1/4

$ 34.50

 

2 J.

2 1/2

2 1/8

1 3/8

$ 38.50

 

2 K.

2 5/8

2 3/8

1 1/2

$ 50.00

 

2 L.

4

2

1

$ 55.00

 

2 M.

3 3/4

2 5/8

1 3/8

$ 70.00




 


 

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BALANGEROITE
San Vittore Mine, Balangero Serpentinite, Lanzo Valley, Piedmont, Italy (type locale)
Balangeroite was first described from this locality in 1983 as aggregates of long, parallel to slightly divergent (fan-like), rich light tan to golden brown color asbestiform fibers.  Chemical composition is (Mg,Fe3+,Fe2+,Mn2+)42Si16O54(OH)40.

Type 1 – Aggregates of pure asbestiform / fibrous, light tan to golden brown color Balangeroite, without matrix.
 

MI-1189 Type 1

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

1 A.

1 3/4

1/2

1/4

$ 14.00

1 B.

1 7/8

7/8

5/8

$ 16.00

1 C.

3 5/8

5/8

1/2

$ 28.50

1 D.

3 3/4

3/4

1/2

SOLD

 1 E.

4 1/2

7/8

1/2

$ 50.00

1 F.

5 1/4

7/8

3/4

$ 60.00

1 G.

5

 1 1/8

1

$ 70.00

 1 H.

5 3/4

1 1/4

1/2

SOLD

1 I.

  Lot of long, hair-like fibers without matrix, in a plastic bag.  Fibers to 2” long, @

$   7.00 /lot
Type 2 – Same as above, with rock matrix.  Due to the long, fibrous nature of this new mineral, matrix specimens are apparently more difficult to recover than examples without matrix.
 

MI-1189 Type 2

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

2 J.

3

1 5/8

7/8

$ 34.50

2 K.

3 5/8

1 1/2

5/8

$ 40.00

2 L.

3 1/4

1 1/2

7/8

$ 55.00

2 M.

3 3/8

1 3/8

3/8

$ 55.00

2 N.

4 1/2

1

3/8

$ 55.00

2 O.

3 1/2

1 1/4

3/8

$ 48.50

2 P.

3 1/2

1 5/8

3/4

$ 48.50

2 Q.

4 1/2

1 3/8

1/2

$ 60.00

2 R.

4

1 1/4

3/4

$ 55.00

2 S.

4 7/8

1 3/4

3/4

$ 70.00

 

 

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E.
MANGANOGRUNERITE (DANNEMORITE)
Brunsjogruvan (Brunsjo Mine), near Grythyttan, Orebro, Sweden
Manganogrunerite (formerly known as Dannemorite), a member of the amphibole group, was found at this locality as long fibrous, compact, asbestiform aggregates with a silky luster, and silvery-tan to silvery-gray color.  Chemical composition is Mn2Fe52+Si8O22(OH)2.
Type 1 – Aggregates of pure asbestiform / fibrous, silvery-tan to silvery-gray color Manganogrunerite, without matrix.
                       

 

MI-1190 Type 1

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

1 A.

2

1/4

1/8

$   8.50

1 B.

1

3/4

1/8

$   6.50

1 C.

1 3/4

1/2

1/4

SOLD

1 D.

1 3/4

5/8

1/8 +

SOLD

1 E.

3 1/4

3/8

3/8

$ 15.00

1 F.

1 7/8

3/4

1/8+

$ 12.50

1 G.

2 1/2

1 1/8

1/4

$ 20.00

Type 2 – Same as above, with minor matrix.  Matrix specimens are often associated with a small amount of massive black Magnetite.  Due to the long, fibrous nature of this new mineral, matrix specimens are apparently more difficult to recover than examples without matrix.

MI-1190 Type 2

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

2 H.

1

5/8

5/8

$  5.00

2 I. 

3

1 1/2

1

$ 45.00

2 J.

2 7/8

1 3/4

1

$ 48.50

2 K.

3 1/4

1 3/8

1

$ 55.00

2 L.

4 1/4

1 1/4

5/8

$ 40.00

2 M.

3 1/2

1 1/4

3/4

$ 48.50

2 N.

3 1/2

1 1/2

5/8

$ 55.00

2 O.

5

1 7/8

1 3/4

$ 70.00
 

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TREMOLITE
Jacksonville, Tuolumne County, California
The Tremolite from this locality consists of elongated, off-white color fibrous aggregates without rock matrix.  Much of the soil in the California “Mother Lode” area is red-brown in color and, in the case of the Tremolite from this locality, some of the red-brown soil is adhering to the Tremolite.  These specimens are delicate and should not be washed
 

 

 

  MI-1192

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

A. 

1 3/8

5/8

3/8

$  8.00

 

B.

 1.50 gram lot of 1/8” to 1/2”  long, off-white color, coarse  hair-like fibers, packaged in a  plastic bag for safe handling.

$  6.50 / lot

 


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ACTINOLITE, FERROAXINITE, ALBITE
New Melones Dam Spillway, Calaveras County, California

The matrix for these specimens consists of intergrown, micro xls. and xline white Albite, associated with minor amounts of  light pink-tan color xline Ferroaxinite on some specimens.  Very clean white, to very pale yellow, hairy-fibrous Actinolite “fur” (like rabbit fur) covers portions of the top of each specimen.  Choice, undamaged, clean examples!  This occurrence is mentioned in the “Mineralogical Record” magazine, September-October 1982, P. 297-298.

 

          

 

 

MI-1193

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

A. 

1 7/8

1 1/4