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= Fluorescent Specimen
   =  Radioactive Specimen

 


2621

2622

2623

2624

2625

BETAFITE (of Hogarth 1977)  (Pyrochlore supergroup) 

Ambolotara, West of the town of Betafo, Betafo Commune, Betafo District, Vakinankaratra Region, Antananarivo Province, Madagascar
Betafite is typically found as a primary mineral in granite pegmatites, and is also rarely encountered in carbonatites.  It was first discovered and described in 1912, and named for the locality near Betafo, Madagascar.  Betafite was redefined in 1977 by Hogarth and the IMA Commission on New Minerals and Mineral Names sub-committee on the Pyrochlore group, and further redefined in 2010 by Daniel Atencio, et al, of the IMA.  The chemical composition of Betafite, as given in the 1999 “Fleischer’s Glossary of Mineral Species”,  is:  (Ca,Na,U)2(Ti,Nb,Ta)2O6(OH)

The specimens available from the Ambolotara locality are all single crystals, without matrix or point of attachment.  The color is yellow-tan, and all are simple octahedrons, or modified octahedrons, as shown in the accompanying photos.   One side of each specimen is fairly flat, as if it were formed up against another mineral, perhaps one of the large flat prism faces of a Quartz crystal, or a large flat face of a Muscovite crystal.  Some specimens also have small amounts of damage due to being loose in the ground for perhaps millions of years.  Please note that Betafite is a metamict mineral, that is, a mineral whose internal crystalline structure has been destroyed by alpha particle emissions from interstitial radioactive impurities. These specimens exhibit the typical result -- the external form is that of the original octahedral crystals, but the Betafite has become internally amorphous.

 

 

 

ITEM
NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2621

2.54

5/8

3/8+

1/4+

SOLD

 

2622

2.56

5/8

3/8+

3/8

SOLD

 

2623

3.24

5/8

1/2

3/8

SOLD

 

2624

4.50

5/8+

1/2

3/8

SOLD

 

2625

6.60

5/8+

5/8

1/2

$  22.00

 

2626

11.50

7/8

3/4

5/8

$  35.00

 

2627

6.91

3/4

3/4

3/8+

SOLD

 

2628

11.85

7/8

3/4

3/4

$  35.00

 

2629

15.85

7/8

7/8

5/8

$  38.00

 


 


2626

2627


2628


2629

1782

1783

1784

THORIANITE 
Andranodambo, North of Fort Dauphin, Madagascar

Thorianite is Th02.  Three lots of Thorianite specimens are available.  Each group consists of individual black masses of pure Thorianite without matrix or associated mineralization.  These are alluvial specimens, so the normal cubic faces are rounded and sometimes slightly rough or pitted. 

 

 

ITEM
NO.

WEIGHT(GRAMS)

SPECIMEN SIZE
(INCHES)

mR/hr @ 1”
CD V-700 GM
COUNTER

CPM @ 1”
CD V-700 GM
COUNTER

 SPECIMEN
PRICE

 

1782

5.00

 Lot of 12 specimens,
+/- 1/8” to 1/4”

12

9,000

$12.50 / lot

 

1783

10.00

 Lot of 16 specimens,
+/- 1/8” to 1/4”

16

10,500

$ 25.00 / lot

 

1784

12.50

 Lot of 8 specimens,
1/4"- 3/8”

10

7,500

$ 35.00 / lot






2571

2572

2573

2574

2575

SAMARSKITE-(Y)
Black Cloud Pegmatite, South Platte District, Teller County, Colorado

Black Cloud Pegmatite, South Platte District, Teller County, Colorado
The Black Cloud Pegmatite is located in the NE¼, NE¼ sec. 9, T.13S., R.70W in central Colorado.  This pegmatite is considered to be part of the South Platte District because of similar structures and mineral occurrences.  Mineralization is a zoned pegmatite body in granite, with the primary minerals being Quartz, Feldspar, and Fluorite.  Workings include a large open cut with 2 benches.  The accompanying photograph of the locality was taken in the summer of 2008, courtesy of Rudy Bolona, a Colorado mineral collector.  Samarskite-(Y) is an uncommon radioactive, uranium and rare earth element bearing mineral with the composition (Y,Fe,U)(Nb,Ta)04.  Specimens consist of vitreous luster, brown-black massive Samarskite-(Y), often accompanied by small amounts of a light colored matrix, probably massive Feldspar.  Items 2572, 2575, and 2576 exhibit some partially developed crystal faces along with the massive Samarskite-(Y).

 

 

ITEM
NO.

 WEIGHT
(GRAMS)

 SPECIMEN SIZE(INCHES)

mR/hr @ 1”
CD V-700 GM COUNTER

CPM @ 1”
CD V-700 GM
COUNTER

 SPECIMEN
PRICE

 

2571

7.60

1 1/4

1/2

3/8

5

3,000

SOLD

 

2572

7.91

3/4

1/2

3/8

4

2,500

SOLD

 

2573

9.65

3/4

1/2+

1/2

5

3,000

SOLD

 

2574

15.32

1

3/4

1/2

5

3,000

SOLD

 

2575

19.75

1 1/8

3/4

5/8

5

3,000

$  49.50

 

2576

22.24

1

7/8

5/8

5

3,000

$  55.50

 

2577

30.20

1

3/4

5/8

7

5,000

$  60.50

 

2578

33.50

1 1/4

7/8

7/8

5

3,000

$  67.00

 

2579

113.35

2 1/4

1 5/8

7/8

8

5,800

$ 225.00

 

2605

4.45

Lot of 6 small specimens, 1/4” to 3/8”

-

-

$9.00 / lot

 

Black Cloud Mine


2576 FRONT

2576B SIDE

2577

2578

2579

 

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