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= Fluorescent Specimen
   =  Radioactive Specimen


2590

2591

2592

2593

2594

2595

2596

2597

2598

2599

2600

2601

THORITE 
Seerie Pegmatite, South Platte District, Jefferson County, Colorado

The Seerie Pegmatite produced small amounts of several radioactive minerals including Thorite, Thorogummite, Synchysite-(Y), Autunite, Zircon Var. Cyrtolite, Allanite, Bastnasite, Uraninite, Kasolite, and Fluorite Var. Yttrofluorite.  Massive, red-brown Thorite is present on all of the specimens described below.  Thorogummite (light yellow), and possible minor amounts of Synchysite-(Y), Autunite, and Zircon Var. Cyrtolite  have been identified on some of the specimens recovered from this particular location within the Seerie Pegmatite, but all of the associates are not available on every specimen.  The photograph of the locality, included here, was provided by Rudy Bolona, a Colorado mineral collector who recovered these specimens from the Seerie Pegmatite circa 2008-2009 and provided the photograph of the locality, also shown on MINDAT.

Thorite is:  ThSiO4, a Thorium Silicate
Thorogummite is:  (Th,U)(SiO4)1-x(OH)4x,   a secondary mineral produced by the alteration of Thorite.  As of 2014, the name Thorogummite was discredited as a mineral species, yet we are using it here to describe the yellow mineral present on the specimens from the Seerie Pegmatite until additional work is done on the mineralogy of this deposit, as well as to follow suit with the minerals described from this locality on MINDAT, and in “Minerals of Colorado”, E. B. Eckel, et al, P. 481-482, 1997.

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

 

2590

6.10

1

3/4

1/4

$  10.50

 

2591

8.35

1 1/4

3/4

5/8

SOLD

 

2592

15.75

1 1/2

3/4

1/2

SOLD

 

2593

31.55

1 3/8

1 1/4

3/4

SOLD

 

2594

41.82

1 3/4

1 3/8

3/4

SOLD

 

2595

48.50

2 1/8

1 3/8

7/8

$  85.00

 

2596

50.25

2 1/4

1 1/8

1

$  90.00

 

2597

58.65

2 1/4

1 1/4

1

$ 100.00

 

2598

70.35

2 1/8

1 1/2

1

$ 125.00

 

2599

76.15

2 1/4

1 5/8

1

$ 130.00

 

2600

92.50

2 3/4

1 3/8

1 1/8

SOLD

 

2601

636.80

4 1/8

2 1/2

2 1/4

$ 475.00

 

2602

5.00

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

$  7.50 / lot

 

 

1913


2288

1918


2289


1923

2290

2287
 

SKLODOWSKITE, URANOPHANE, HETEROGENITE
Mashamba West Mine, Kolwezi District, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaire)

Sklodowskite from this locality was found as canary yellow-golden crystals, very richly deposited in small, open vuggy areas in/on light colored matrix.  Sklodowskite is: Mg(UO2)2Si2O7.6H2O  The specimens were acquired from the collection of Dr. E. L. Quinter of New York in 1990.  Magnification of ~10X is needed for best appreciation of the crystallization.  On the larger specimens, hundreds of terminated micro xls. of Sklodowskite are present on the front, and also on the back each specimen.  Two photos, showing the close-up detail of the Sklodowskite crystallization, are provided for your information.   Associated minerals include pale yellow acicular Uranophane, and occasionally black massive Heterogenite.  Item MI-1924 contains 3 very nice specimens for micromount preparation, with little or no trimming needed.


 

ITEM   NUMBER   MI-  

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

1913

7/8

1/2

1/4

SOLD

1918

2 1/8

1 5/8

7/8

$ 60.00

1923

3

1 1/2

1

$ 95.00

2287

1 3/8

7/8

7/8

SOLD

2288

1 1/2

1 1/8

1

SOLD

2289

1 7/8

1 1/2

7/8

$ 65.00

2290

2 5/8

1 3/4

7/8

$ 90.00

1924

Lot of 3 small speci-mens, 1/4” to 1/2”

$ 18.00 /
lot of 3

 
 
  Microphotographs showing typical morphology of crystals

1718

1728

1729

1732

2050

2050 magnified

2051

2051 magnified

2607

2608

2609

2610

2611

2612

BOLTWOODITE    
Goanikontes Claim, Arandis, Swakopmund District, Erongo Region, Namibia

The revised name for this locality, formerly known as the Rössing Mine, is the Goanikontes Claim.  According to MINDAT, the Rössing Mine was previously thought to be the source of the Namibian Boltwoodite specimens, but recently the true source of the crystallized Boltwoodite has been revealed.  The Goanikontes Claim is located 4 km SE of Goanikontes, and about 27 km E of Swakopmund.  The Goanikontes Claim is actually about 40 km from the Rössing Mine, the previously reported source of the fine Boltwoodite specimens!  If you have purchased Boltwoodite specimens from us in the past, labeled as having been found at the Rössing Mine, please revise your collection labels to reflect the new, corrected locality information.  The specimens offered here were purchased from an American geologist who worked in the district as a consultant during 1996.

The Goanikontes Claim is perhaps the best known locality for Boltwoodite specimens, worldwide!  Boltwoodite is an uncommon hydrous potassium uranium silicate.  It forms as bright yellow-golden color hemispherical aggregates (2 to 4 mm across), composed of radially structured acicular Boltwoodite crystal groups, scattered across the front of the matrix, as compact aggregates composed of tightly intergrown, radially structured needles filling open vuggy areas in the matrix, and / or as individual prismatic terminated crystals forming loosely aggregated sprays of bright yellow-golden prismatic crystals.  Small, dark brown scalenohedral crystals of Calcite are often associated, deposited upon the matrix before the Boltwoodite.  Secondary, drusy, colorless Gypsum crystals are also often present, sometimes completely covering the Boltwoodite like a coating of transparent ice!  Other minerals which may be found on some of these specimens include small amounts of β-Uranophane, Pyrolusite, and micro Quartz crystals.   Boltwoodite is sometimes fluorescent a pale, dull orange color under both SW and LW UV, with the strongest response under LW.  The radioactive responses of these specimens are generally fairly low, as the amount of Boltwoodite present is not a significant part of the volume of each specimen.  NOTE:  Items MI-2050, 2051, and 2614 are particularly interesting for micromount preparation.

 



 

 

ITEM
NUMBER

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

1718

1 3/4

1 1/8

7/8

$  30.00

 

1728

2 1/4

1 1/2

5/8

$  48.50

 

1729

2 1/8

1 3/8

1 1/4

$  80.00

 

1732

2 1/2

1 5/8

1 3/8

$ 100.00

 

2050

1 1/2

1 1/4

1

$  35.00

 

2051

7/8

7/8

7/8

SOLD

 

2607

5/8

3/8

1/4

SOLD

 

2608

3/4

3/4

5/8

SOLD

 

2609

1 1/8

5/8

1/2

SOLD

 

2610

1

1/2

1/2

$  18.00

 

2611

1 1/2

1 1/4

1

$  20.00

 

2612

1 1/2

1 1/8

7/8

$  22.50

 

2613

2 1/4

1 1/4

1

$  28.50

 

2614

1 1/4

1 1/8

7/8

$  45.00

 

2615

2 7/8

2

1

$  55.00

 

2616

3 1/2

1 5/8

1 1/4

$  60.00

 

2617

1 5/8

1 5/8

1

$  65.00

 

 


2613


2614


2615


2615


2616

 

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