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RARE MINERALS, NATIVE ELEMENTS & MICROS FOR DISCRIMINATING COLLECTORS   


  
NEW ACQUISITIONS


 

MELANOPHLOGITE
Mt. Hamilton, Santa Clara County, California
This occurrence for crystallized Melanophlogite was first reported in the American Mineralogist, Vol. 57, P. 1494-1495, with additional information appearing in Vol. 58, P. 346.  For additional information about the Melanophlogite from the Mt. Hamilton occurrence see the “Mineralogical Record” magazine, Vol. 33, P. 237-242 (May-June 2002), and MINDAT.org.  Specimens featured here were collected in 1972.  The accompanying photos were taken with a Dino-Lite digital microscope, and illustrate the areas of interest on each specimen.  Actual specimen sizes are given below.   Magnification of 10-20X is required for best appreciation of the crystallization on all specimens.  Due to the nature of the matrix, many of the specimens have sawed bases.                                                                                                                                                                                                                                                                                                                                                                                                     

               

 

ITEM # MI-

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

1658

1

3/8

1/4

SOLD

 

1659

5/8

5/8

1/2

SOLD

 

1660

1 1/4

5/8

1/2

SOLD

 

1661

1 1/4

3/4

1/2

SOLD

 

1662

1

5/8

5/8

SOLD

 

1663

1 1/4

1 1/4

7/8

SOLD

 

1664

1 1/4

3/4

3/8+

SOLD

 

1665

2 1/4

7/8

5/8

SOLD

 

1666

1 1/4

1 1/4

1/2

$ 30.00

 

1667

1 7/8

1 1/8

+/- 1/2

$ 35.00

 

1668

2 1/2

1 1/2

1

$ 40.00

 

1669

2 7/8

1 1/2

5/8

$ 45.00


MI-1659

MI-1660

MI-1661

MI-1662
 

MI-1663

MI-1664

MI-1665

MI-1666

MI-1667

MI-1668

MI-1669

 

JAMESITE
Tsumeb Mine, Tsumeb, Namibia (Dana & type locale)
Jamesite is a very rare mineral, described from the Tsumeb Mine in 1981.  It is red-brown in color, acicular to fibrous, and forms radial or sphere-like aggregates, as well as flattened, fan-like sprays, always very small.  The specimens shown at the left are from the original find of Jamesite associated with Tsumcorite, made by Walter Kahn in the 1970’s, which produced the type specimen of Jamesite.  Pricing is according to the richness of the Jamesite, not relative to the size of the matrix.  Chemical composition is: Pb2ZnFe2 3+ (Fe 3+,Zn)4(AsO4)4(OH)8(OH,O)2.   Magnification of 20-50X is required for best appreciation of the crystallization on all specimens.  The acicular, red-brown Jamesite xl. sprays are < 1 mm on all specimens except item E., which has a 2 mm diameter, fan-like spray of acicular Jamesite.  Typical associates are Tsumcorite (Ts, yellow-golden color), Duftite (Du, olive to dark green color), Dolomite (Do, white), Mimetite (M, massive, near white to pale yellow micro xls.), Plancheite (P, acicular, white), and/or Goethite (G, brown to black).  Quartz is often associated as part of the matrix, and micro Quartz xls. are occasionally present.  References: American Mineralogist, 66:1275 (1981),  “Dana’s New Mineralogy”, P. 880, the “Mineralogical Record” magazine, May-June 1982, P. 141, and the “Handbook of Mineralogy”, Vol. IV, P. 263.  Brief descriptions of the specimens follow:

A.  A very small amount of Jamesite (50X required) is on matrix with Dolomite, Duftite, Plancheite, and Goethite.  On the reverse side of the matrix, a rich aggregate of yellow-golden xline Tsumcorite (1/2” X 3/8”) is associated.

B.  The entire top of this specimen is covered with yellow-golden xline and botryoidal Tsumcorite.  Two individual, flat sprays of parallel growth to radially structured Jamesite formed on top of the Tsumcorite – one of the sprays is illustrated here.  Magnification of 20-30X is required.  Associates are minor, all on the back of the matrix.

C.  Two areas on this specimen have sprays of brick red acicular Jamesite.  The best, illustrated here, has black micro spheroids of Goethite associated.  Magnification of 20-30X is required.

D.  A flat, radially structured spray of Jamesite was deposited on yellow-golden, botryoidal / xline Tsumcorite. Magnification of 20-30X is required.  Other associated minerals are present in small amounts.

E.  A flat-laying, fan-shaped spray of brick red acicular Jamesite is on very dark yellow-golden botryoidal Tsumcorite. Magnification of 20-30X is required.  This specimen also has small amounts of massive Tennantite, native Copper and Cuprite, plus at least two unknowns, all present as inclusions within the matrix.

 

MI-1082

SPECIMEN SIZE
(INCHES)

ASSOCIATED
MINERALS

SPECIMEN
PRICE

A.

1 1/4

1 1/4

7/8

Ts, Du, M, G, Do, P

SOLD

B.

 1 7/8

1 5/8

1 1/8

Ts, Du, Do, G, M

SOLD

C.

1 1/4

3/4

1/2

Du, G, Do, Ts, P

SOLD

D.

1

1

1

Ts, Du, Do, M, P

$  90.

E.

2 1/8

1 1/4

1

Ts, Du, M, G,  +

SOLD

      

A.

B.

C.

D.

E.

OLMIITE
Wessels Mine, Kalahari Manganese Field, No. Cape Province, South Africa  (Dana and type locale)
Olmiite was described as a new mineral from this locality in 1993 and, until very recently, it was regarded as a very rare mineral.  A new find circa 1999-2000 yielded beautifully crystallized specimens!   Olmiite typically forms prismatic single crystals (SX), wheat-sheaf crystal groups (WS), or spheroidal aggregates (SP).  Color on these specimens is cream-white, to pale tan.  Ultraviolet fluorescence is deep red under shortwave UV.  The chemical composition is: (Ca,Mn2+)2(SiO3OH)(OH).  Additional information can be found in “Dana’s New Mineralogy”, Gaines, et al, 1997, P. 1705, “Minerals of South Africa”, Cairncross and Dixon, 1995, P. 231, and “Handbook of Mineralogy”, Vol. II, Part 2, Anthony, et al, 1992, P. 654.

MI- 1083

CRYSTAL
HABIT

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

A. SX 7/8 1/2 1/2 $ 15.00

B.

WS

7/8

1/2

3/8

SOLD

C.

SX + WS

1 3/8

1

3/4

SOLD

D.

SX + WS

1 5/8

5/8

1/2

$  25.00

E.

WS

3/4

1/2

1/2

SOLD  

F.

WS

1 1/2

3/4

1/2

SOLD

G.

SX

1

3/8

3/8

SOLD

H.

SP

1

1

7/8

$  30.00

I.

SX + WS

1 1/8

1

3/8

SOLD

J.

WS

1 1/2

5/8

1/2

SOLD

mi1083a.jpg (24411 bytes)
A.
mi1083b.jpg (18862 bytes)
B.
mi1083c.jpg (28861 bytes)
C.
mi1083d.jpg (23980 bytes)
D.
mi1083e.jpg (17618 bytes)
E.
mi1083f.jpg (23659 bytes)
F.
mi1083g.jpg (19121 bytes)
G.
mi1083h.jpg (27457 bytes)
H.
mi1083i.jpg (22444 bytes)
I.
mi1083j.jpg (20889 bytes)
J.


MINIUM
Tsumeb Mine, Tsumeb, Namibia
Minium is red-orange in color, and is generally found as an oxidation product of Galena and other Lead minerals.  From Tsumeb, it is always found in massive form and it is quite rich on these specimens.  On the larger examples the bright red-orange Minium is totally disseminated through the matrix.  These specimens were mined within the last 3 years.  Pricing is according to the richness of the specimen, not necessarily relative to the overall size of the specimen.  Chemical composition is:  Pb2+2Pb+4O4

MI-1138

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

A.

1 1/8

7/8

1/2

$ 15.00

B.

1 1/4

1 1/8

1/2

SOLD

C.

1 3/4

1 3/8

1

SOLD

D.

1 3/4

1 1/2

3/4

SOLD

E.

1 3/4

1 1/4

1

SOLD

F.

2 3/4

1 1/2

1 1/2

SOLD

 

 


A.

B.

C.

D,

E.

F.


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