longmrclogo.gif (25976 bytes)

 

 


TO PURCHASE RADIOACTIVE MINERALS, DOWNLOAD LIABILITY WAIVER CLICK HERE, PRINT, SIGN AND FAX, OR EMAIL BACK.

IMPORTANT SAFETY INFORMATION REGARDING RADIOACTIVE MINERAL SPECIMENS ! !  CLICK HERE

 

 


DUE TO CURRENT INTERNATIONAL POSTAL REGULATIONS, WE CAN ONLY SHIP  RADIOACTIVE MINERALS TO DESTINATIONS LOCATED WITHIN THE U.S.A.
 


= Fluorescent Specimen
   =  Radioactive Specimen

 


2699

2700

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-element 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.  Chemical composition
is:  (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8

 

   ITEM
NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2699

11.90

1 1/4

7/8

1/4

SOLD

 

2700

19.65

1 1/8

5/8

5/8

SOLD

 

2701

22.40

1 1/2

1/2

1/2

$ 28.00

 


2701


Burroughs Mine


2703

2704

2705

2706

2707

ALLANITE-(Ce)  

Gunshot Prospect, Trout Creek Pass, Chaffee County, Colorado

Specimens available are pure, fresh and unweathered, dark brown Allanite-(Ce) masses with little or
no matrix.  Chemical composition is:  {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

 

 

 

 

 ITEM
NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2703

3.30

3/4

1/2

3/8

SOLD

 

2704

4.20

3/4

1/2

1/4+

$   7.25

 

2705

5.00

1 1/8

3/8

3/8

$   8.75

 

2706

5.45

1

1/2

3/8

$   9.50

 

2707

9.73

7/8

7/8

1/4+

$ 17.00

 

2708

15.40

1 1/4

3/4

5/8

$ 27.25

 

2709

6.30

Lot of 4 small specimens, 1/2” to 5/8”

$ 11.00
 / lot

 

2710

10.65

Lot of 4 small specimens, 5/8” to 1”

$ 18.50
/ lot





 

 
2708

2709

2710

2711

2712

2715

2716

2717

2759

GADOLINITE-(Y) with FLUORITE Var. YTTROFLUORITE
White Cloud Pegmatite, South Platte District, Jefferson County, Colorado

Dark brown massive Gadolinite-(Y) is present as pods and masses in matrix of massive, pale tan color Yttrofluorite, which fluoresces very weak yellow in SW UV light. Yttrofluorite is a variety of Fluorite
containing an appreciable amount of yttrium (Y) taking the place of calcium (Ca) anions in the Fluorite structure. Very minor massive Allanite-(Ce), plus secondary rare earth carbonate alteration phases,
are also present on some of the specimens. As shown in some of the accompanying photos, a few of the small specimens have the massive Gadolinite-(Y) surrounded by massive, red-brown “eyes” of Allanite-(Ce), in / on Yttrofluorite matrix. Item 2717 is particularly rich, with a large crystalline mass of Gadolinite-(Y) covering much of the surface of the Yttrofluorite matrix.  Price varies according to the richness of the Gadolinite-(Y), not relative to the overall size of the specimen. 

Chemical compositions are as follows:

Gadolinite-(Y):  Y2Fe2+Be2Si2O10

Yttrofluorite:     (Ca1-xYx)F2+x where 0.05< x <0.3
Allanite-(Ce):    {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

 

 

 

 ITEM
NO.

 WEIGHT
(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2711

8.35

1

5/8

1/4

SOLD

 

2712

10.30

1 1/8

3/4

1/4

SOLD

 

2715

50.90

1 1/2

1 1/8

7/8

$  75.00

 

2716

83.85

2 1/2

1 1/4

1

$  85.00

 

2717

112.60

2 3/4

1 3/8

1

$165.00

 

2759

13.82

1 1/4

5/8

5/8

$  24.50

 

2760

17.70

1 1/8

5/8

5/8

$ 36.00

 

2718

8.26

Lot of 4 small specimens 1/4” to 3/4”

SOLD

 

2719

20.25

Lot of 5 small specimens 1/2” to 3/4”

$  30.00


 


2760


2718


2719


2720

2721

SAMARSKITE-(Y) 
Oregon #3 Mine, South Platte District, Jefferson County, Colorado

Samarskite-(Y) is an uncommon radioactive, uranium and rare earth element bearing mineral with
the composition (Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8.  Samarskite-(Y) is very shiny brown-black on a freshly broken surface, exhibiting conchoidal fracture, and has a dull luster on unbroken or natural surfaces.  The pegmatite deposits of the South Platte District have been known since the 1920’s and worked for rare earth element bearing minerals, and other minerals of economic importance, beginning in the early 1950’s.  These specimens were probably collected circa the early 1970’s.  Both specimens have masses of brown-black Samarskite-(Y) with a minimal amount of matrix.

 

 

 ITEM NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2720

18.90

1 1/8

3/4

3/4

$   23.50

 

2721

174.00

2

2

1 1/2

$ 175.00


 


1816

1817

1820

SAMARSKITE-(Yb
Little Patsy Pegmatite, South Platte District, Jefferson County, Colorado  (type locality)

Samarskite-(Yb) was identified as a new species, and a new member of the Samarskite group, from the Little Patsy Pegmatite.  It occurs as black, vitreous luster, metamict, anhedral masses with a conchoidal fracture, sometimes intergrown with / associated with Ferrocolumbite and Zircon Var. Cyrtolite.  Other minerals sometimes found associated are Ishikawaite, Samarskite-(Y), Zircon, Columbite, Monazite-(Ce), and yttrian Fluorite (= Yttrofluorite).  A complete write-up covering this new member of the Samarskite group appears in “The Canadian Mineralogist”, Vol. 44, pp. 1119-1125 (2006).  A copy of the 7 page write-up from “The Canadian Mineralogist” will be sent with each specimen, if requested.  All specimens were supplied by one of the authors of the article.  Note:  The gram weights are given as a measure of size -- specimens are not priced by the gram.  The simplified formula is: (Yb,Y,REE,U,Th,Ca,Fe2+)(Nb,Ta,Ti)O4;

           

ITEM
NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(MILLIMETERS)

  SPECIMEN
PRICE

 

1816

.65

8

7

4

SOLD

 

1817

1.10

15

10

4

SOLD

 

1820

4.75

18

13

7

$   90.00

 

1821

6.43

23

13

11

$ 120.00

 

1822

1.18
(lot of 2)

8&12 

5&6

4&5

$   28.50
/ lot

 


1821

1822


2722

2723

GADOLINITE-(Y) with FLUORITE Var.  YTTROFLUORITE  
Lesser White Cloud Pegmatite, South Platte District, Jefferson County, Colorado

This is a slightly different locality from the Gadolinite-(Y) with Yttrofluorite mentioned above. 
The collector who recovered these specimens notes that this occurrence of REE minerals has not
been reported on MINDAT yet.  Item 2722 has a group of two very crudely developed, terminated,
dark brown-black Gadolinite-(Y) crystals on Fluorite Var. Yttrofluorite matrix.  Yttrofluorite is a variety of Fluorite containing an appreciable amount of yttrium (Y) taking the place of calcium (Ca) anions in the Fluorite structure.   Item 2723 has several small, dark brown masses of Gadolinite-(Y) on both sides of the specimen associated with, and sometimes surrounded by massive, red-brown “eyes” of Allanite-(Ce), on Yttrofluorite matrix.

 

 

 ITEM
NO.

 WEIGHT(GRAMS)

 SPECIMEN SIZE(INCHES)

 SPECIMEN
PRICE

 

2722

93.45

2 1/4

1 1/2

1 1/4

$150.00

 

2723

250.50

3 1/2

2

1 1/4

$160.00

 

 

        MORE SPECIMENS   PAGE 1  2  3  4  5  6  7  8  9  10

Copyright 1998-2016 by Mineralogical Research Co.
All rights reserved.