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MI-1409

MI-1410

MI-1411 |
SAMARSKITE-(Y) 
Burroughs Mine (Burroughs Pegmatite), Kerr Gulch, South Platte
District, Jefferson County, Colorado
The Burroughs Mine has produced very good, rich specimens of Samarskite-(Y)
as well as several other rare earth-bearing minerals. The South Platte
District contains over 50 pegmatites, many of them known since the early
1920’s when they were first prospected for Feldspar. See the accompanying
photo of this locality, supplied by Rudy Bolona, a Colorado mineral
collector – nice looking place to go field collecting! The three
specimens available from the Burroughs Mine consist of solid black massive
Samarskite-(Y), without rock matrix or associated minerals. On a fresh
surface, the Samarskite-(Y) exhibits the characteristic, very shiny
glass-like luster and conchoidal fracture. Several flat faces on the back
of item C. suggest that this specimen may have formed in contact with
crystallized Quartz or Feldspar.
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ITEM
NO.
MI- |
WEIGHT(GRAMS) |
SPECIMEN SIZE(INCHES) |
mR/hr @ 1”
CD V-700 GM
COUNTER |
CPM @ 1”
CD V-700 GM
COUNTER |
SPECIMEN
PRICE |
|
1409 |
7.83 |
1 |
1/2 |
1/4+ |
8 |
5,500 |
SOLD |
|
1410 |
12.25 |
3/4 |
3/4 |
1/2 |
10 |
7,500 |
SOLD |
|
1411 |
47.40 |
1 1/2 |
1 |
5/8 |
13 |
9,000 |
SOLD |
More
specimens coming soon

Burroughs Mine |
|

1797

1798

1799

1800

1801

1802

1803

1804

1805 |
CUPROSKLODOWSKITE

Musonoi Mine, near Kolwezi, Shaba Province, Zaire (Dem. Republic of
the Congo)
The Musonoi Mine is famous for its world-class specimens of
Cuprosklodowskite, a uranium and copper-bearing silicate. Classic
examples are composed of bright apple-green Cuprosklodowskite most often
found as acicular needles, compact radial intergrowths, and fairly
infrequently as intergrown aggregates of terminated crystals where voids
occur within the matrix. With the ongoing embargo against importing
radioactive minerals from outside of the USA, it has been very difficult
for us to find specimens to offer on the web site. The specimens
illustrated here are from a dealer’s stock imported from Zaire more than
25 years ago. The Cuprosklodowskite on these specimens is present as
bright apple green masses, without rock matrix. These are very good
reference specimens, and are excellent for demonstrating the radioactivity
of the mineral. Most specimens do not show any evidence of
crystallization.
All examples have apple green massive
Cuprosklodowskite present, very occasionally accompanied by micro acicular
Cuprosklodowskite. The associated minerals are abbreviated and described
below. A list of the associated minerals found on each specimen is
incorporated into the table, below.
| Ma = |
Malachite |
Medium to dark green, acicular to massive |
| Me = |
Metatorbernite |
Medium green, platy |
| G = |
Guilleminite |
Bright canary yellow, massive |
| V = |
Vandenbrandeite |
Dark green, massive to small “leopard spots” and/or micro
crystalline |
| Sk = |
Sklodowskite |
Bright yellow, acicular to fibrous, to massive |
| Se = |
Selenian Digenite |
Massive, metallic grey-black |
| R = |
Rutherfordine |
Straw yellow to yellow-tan, massive |
NOTE 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.
For background information on Cuprosklodowskite,
see the special Katanga issue of the “Mineralogical Record” magazine, Vol.
20, No. 4, July-Aug 1989, P. 265-288. The Nov-Dec 2002 issue (Vol. 33,
No. 6) of the “MR”, P. 484-485 has current information on the status of
the Musonoi Mine --- along with a photo of the now abandoned mine. Two
photos of exceptional Metatorbernite and Cuprosklodowskite specimens,
which were previously collected at Musonoi, also accompany the article.
NOTE: The special Katanga issue of the
“Mineralogical Record” magazine is available for sale – see the bottom of
this page for additional information.
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|
ITEM
NO.MI- |
WEIGHT(GRAMS) |
SPECIMEN SIZE(INCHES) |
ASSOC.
PRESENT |
mR/hr @ 1”
CD V-700 GM
COUNTER |
CPM @ 1”
CD V-700 GM
COUNTER |
SPECIMEN
PRICE |
|
|
1797 |
2.95 |
3/4 |
1/2 |
1/4 |
Sk, Se |
20 |
13,300 |
SOLD |
|
|
1798 |
5.20 |
1 |
3/8 |
3/8 |
Sk |
22 |
14,000 |
SOLD |
|
|
1799 |
17.00 |
1 |
7/8 |
5/8 |
Ma, Me |
15 |
10,000 |
SOLD |
|
|
1800 |
20.16 |
1 1/4 |
7/8 |
3/4 |
Sk, G |
35 |
22,500 |
$ 40.00 |
|
|
1801 |
20.42 |
1 1/4 |
1 1/8 |
5/8 |
V, Ma, Sk |
35 |
22,500 |
$ 45.00 |
|
|
1802 |
25.18 |
1 3/8 |
1 1/4 |
7/8 |
V, Sk, Ma, G |
40 |
25,000 |
$ 55.00 |
|
|
1803 |
29.48 |
1 3/8 |
7/8 |
1/2 |
V, Ma, Sk, R |
> 50 |
> 30,000 |
SOLD |
|
|
1804 |
31.94 |
1 1/8 |
1 1/8 |
3/4 |
Ma, G, V |
30 |
26,000 |
$ 60.00 |
|
|
1805 |
35.85 |
1 1/4 |
1 |
7/8 |
Ma, V, G |
45 |
27,500 |
$ 70.00 |
|
|
1806 |
38.15 |
1 1/4 |
1 1/8 |
7/8 |
Sk, G |
> 50 |
> 30,000 |
SOLD |
|
|
1807 |
38.73 |
1 3/8 |
7/8 |
7/8 |
G, V, Ma, Sk |
50 |
30,000 |
SOLD |
|
|
1808 |
47.37 |
1 3/8 |
1 1/8 |
5/8 |
G, V, Ma |
> 50 |
> 30,000 |
SOLD |
|
|
1809 |
96.28 |
2 1/2 |
2 |
7/8 |
G, Ma, V, Sk |
> 50 |
> 30,000 |
SOLD |
|
|
1810 |
96.65 |
2 1/8 |
1 7/8 |
1 |
V, Ma, G |
> 50 |
> 30,000 |
$ 190.00 |
|
|
1811 |
108.00 |
2 1/2 |
1 1/2 |
1 1/8 |
Sk, Ma |
> 50 |
> 30,000 |
$ 195.00 |
|
|
1812 |
268.35 |
2 5/8 |
2 1/8 |
2 |
Ma, V, Sk |
> 50 |
> 30,000 |
$ 475.00 |
|
|
1813 |
3.35 |
Lot of 6 specimens, +/-1/8” up to 5/8”
X 5/8” |
Ma |
25 |
10,000 |
$ 10.00
/ lot |

1806 |

1807 |

1808 |

1809 |

1810 |

1811 |

1812 |
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|
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NEW TITLE
“KATANGA! … URANIUM DEPOSITS”, By G. Gautier, A.
Francois, M. Deliens, and P. Piet, 11” X 8”, 63 pages, with 19 color
photographs, 12 crystal drawings, several maps and tables, soft cover.
The primary article of interest in this special issue of the
“Mineralogical Record” magazine is entitled “Famous Mineral Localities:
the Uranium Deposits of the Shaba (Katanga) Region, Zaire”. Since the
days of Stanley and Livingstone, the Shaba region has been known as one of
the world’s great mineralized areas. A crescent shaped deposit about 300
km in length and nearly 50 km wide extends from the town of Kolwezi in the
west, to the city of Lubumbashi in the east. This area is the location of
several very important Uranium mines, including familiar names like
Shinkolobwe, Swambo, Kamoto, Mashamba-West, Luiswishi, and Musonoi. The
mining history is given in some detail, including notes on the production
of Copper and Uranium ores in the Katanga region. The general geology of
the district is given, including a stratigraphical map of the Katanga
System. Four of the most important mines are then discussed in detail,
accompanied by geological maps and black & white photos of the mine
sites. Data is then given on each of the important minerals – primary
minerals, then secondary Uranium minerals. This section is accompanied by
19 exquisite color photographs illustrating many of the secondary
Uranium-bearing minerals, along with a dozen crystal drawings. The color
photos and crystal drawings will be of prime importance to anyone studying
and / or collecting secondary Uranium-bearing minerals, as an aid in
visual identification of the minerals from the various mines of the
region. Four tables accompany the text, each containing a list of the
minerals found at one of the following mines: Shinkolobwe, Swambo, Musonoi,
and Kamoto. The authors have included a large list of references, for
further reading. Two other articles are included in this special issue of
the “Mineralogical Record” magazine – “Rome Delisle and His Bibliography”,
by W. Wilson, and “Additions and Corrections to the Glossary of Mineral
Species", 5th Edition (1987)” by M. Fleischer. Published by the
Mineralogical Record, Inc., Tucson, Arizona, as the special issue on
Katanga, Volume 20, No. 4, July-August 1989.
Shipping weight: 2 pounds
Order Item MR20-4
Price: $20.00 |