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= Fluorescent Specimen
   =  Radioactive Specimen

 


2688

2689

2690


2691

CAROTITE, CHRYSOCOLLA
Mashamba West Mine,
Kolwezi District, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)

Originally thought to be Marthozite when it was first found circa the late 1980’s, more recent analyses have shown that this is definitely crystallized Carnotite.  All specimens exhibit yellow-ocher color tabular plates of Carnotite on matrix of massive, blue-green Chrysocolla.  The association of Carnotite with Chrysocolla makes the specimens visually appealing, and provides a positive identification insofar as the locality of origin – definitely an unusual association!  Carnotite has not been identified from any of the other localities in the Katanga Copper Crescent.  For background information on the find of Carnotite from the Mashamba West Mine see the “Mineralogical Record”, Jan-Feb 1991, Page 17.  Item 2693 only has a very rich amount of crystallized Carnotite, on a dark colored matrix composed of massive to micro crystalline, dark red-black Cuprite, along with a black massive unknown, possibly Heterogenite.

 

 ITEM
NO.

 SPECIMEN SIZE|
(INCHES)

 SPECIMEN
PRICE

 

2688

1 1/8

5/8

1/8

SOLD

 

2689

1 1/8

5/8

1/8

$  15.00

 

2690

1

3/4

1/4

SOLD

 

2691

1 1/2

5/8

1/8

SOLD

 

2692

1 1/2

7/8

1/2

$  20.00

 

2693

1 3/8

1

5/8

$  55.00

 


2692

2693 FRONT

2693 BACK
 

1876

1877

1878

1879

1880

1881

URANINITE,  BORNITE    
Blue Lizard Mine (Markey Mine), Red Canyon, White Canyon District, San Juan County, Utah

In addition to the uranium-bearing minerals, three copper-bearing sulfide minerals were identified from the Blue Lizard Mine (Bornite, Chalcopyrite and Covellite), along with small amounts of Pyrite.  The presence of the sulfides in the ores from this sedimentary deposit sometimes yielded combinations of uranium and copper-bearing minerals that produced ores with low radioactive readings.  Bornite, a dark metallic blue-black mineral, gives a distinct dark blue color and sheen to the areas of the specimens when it is present.  The combination of the shiny black Uraninite + dark metallic blue-black Bornite on the polished surfaces is distinctive of this locality.  Many times the Uraninite and sulfide ores were formed in areas where, during the Triassic age, “the deposition apparently took place under strongly reducing conditions, as evidenced by the occurrence of sulfides, … carbonized wood, and other vegetal matter.”*  On most  of the specimens listed below, with magnification, one can discern the outline or structure of small amounts of wood that have been replaced by Uraninite and / or Bornite, etc.  All of the specimens listed below were mined in the period between the mid-1950’s to early 1960’s.  With the exception of specimen MI-1878, all of the specimens have been cut and polished, and many have Epoxy applied to the edges and backs of the specimens.  Epoxy was often used to stabilize specimens before they could be cut and polished, as part of the process of analyzing the richness or potential of the ore.  The Epoxy provides some measure of protection for handling the specimens.  All specimens are from the collection of Dr. Eugene B. Gross.

# Items MI-1878, 1879, 1883 and 1884 have a high percentage of Bornite present, a copper-bearing mineral which is not radioactive.  Item MI-1878 shows the elongated structure of the wood grain, with the wood partially replaced by Bornite and Uraninite.  Item MI-1879 is a complete replacement of metallic blue-black Bornite after a section of a tree limb that was probably originally ~ 3” in diameter.  Only a minimal amount of Uraninite is present.  On the edges of the specimen, the structure of the wood is very obvious when viewed with magnification.  The AEC lab technicians coated the top of the specimen with Epoxy, then cut and polished it.  Additionally, a border of Epoxy still remains around the perimeter of the top end of the specimen.  MI-1883 and 1884 are a pair, originally cut from the same ore sample.  With 10-20X magnification, one can see the curved wood structure on the cut surfaces of both specimens.  A 10% discount is offered for the pair. List price: $250.00, discount price / pair: $225.00

N = natural                 PS = polished slice                  PEC =  polished end cut                     EP = Epoxy present   

* “Systematic Mineralogy of Uranium and Thorium”, C. Frondel, USGS Bulletin 1064, P. 45 (1958).

ITEM
NO.
 

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 CONDITION /
PREPARATION

mR/hr @ 1”
CD V-700 GM
COUNTER

CPM @ 1”
CD V-700 GM
COUNTER

SPECIMEN
PRICE

1876

31.10

1 5/8

1 1/4

up to 3/4  

PEC

20

13,300

SOLD

1877

43.00

1 3/4

7/8

7/8

PEC

20

13,300

SOLD

1878

67.00

2 1/2

1 1/2

5/8

N

5 #

3,000 #

$   55.00

1879

103.45

1 3/4

1 1/8

1

PEC, EP

0 #

0 #

$   95.00

1880

124.50

1 7/8

1 1/2

5/8

PEC, EP

35

22,500

SOLD

1881

196.50

2 7/8

1 7/8

1

PEC, EP

50

30,000

SOLD

1882

198.65

2 7/8

2

3/4

PS, EP

50

30,000

SOLD

1883

59.84

1 7/8

1 3/8

1/2

PS

5 #

 3,000 #

SOLD

1884

208.50

2 1/4

2 1/4

1 3/8

PEC

5 #

3,000 #

SOLD


 


1882


1883

1884

2580
2581

2582

2583

2584

MONAZITE-(Ce) 
Eureka Farm 99 (Stiplemans Mine), 21 Miles WSW of Usakos, Karibib District, Erongo Region, Namibia

The Eureka Farm 99, or Stiplemans Mine, was a Monazite prospect in a carbonatite, formed in a dolomitic marble.  The iron-stained marble host rock produced individual red-brown Monazite-(Ce) crystals, as well as red-brown Monazite-(Ce) cleavages.  Monazite-(Ce) has a well developed parting cleavage which is very obvious in the specimens described below.   No crystallized Monazite-(Ce) is available in this group of specimens.  Monazite-(Ce) is a slightly radioactive REE-bearing mineral with the composition: (Ce,La,Nd,Th)(PO4)

 

NOTES REGARDING PRICING: The gram weights of the specimens are given in the table below, simply as a measure of specimen size.  The specimens are not sold by the gram.

 

ITEM
NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2580

4.45

3/4

1/2

1/2

SOLD

 

2581

17.15

1 1/4

3/4

3/4

SOLD

 

2582

28.35

1 3/8

1 1/4

5/8

SOLD

 

2583

36.75

1 1/4

1 1/8

1

SOLD

 

2584

39.70

1 1/2

1 3/8

7/8

SOLD

 

2585

77.40

1 3/4

1 3/8

7/8

$   94.00

 

2586

89.35

2 1/8

1 7/8

1

$ 120.00

 

2587

115.15

2 3/8

1 1/2

1

$ 150.00

 

2588

120.20

2

2

1 1/2

$ 160.00

 

2589

261.10

4

2 1/4

1 1/4

$ 340.00

 

2604

5.00

Lot of 4 small specimens, 1/4” to 1/2”

$  7.50 / lot






 


2585

2586

2587

2588

2589

 

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