longmrclogo.gif (25976 bytes)


RARE MINERALS, NATIVE ELEMENTS & MICROS FOR DISCRIMINATING COLLECTORS   

  
NEW ACQUISITIONS


2959

2960

2961A

2961B

2962

JONESITE
California State Gem Mine (Dallas Gem Mine), San Benito County, California (type locality)

The specimens listed below were mined pre-1990 during a time period when the Dallas Gem Mine was still being worked on a semi-commercial basis.  Each specimen was carefully etched out of the enclosing massive Natrolite matrix to reveal the radial sprays of colorless-white micro Jonesite crystals on altered blue-gray Crossite-bearing serpentine matrix.  Small amounts of the typical massive white Natrolite matrix remain on most specimens.  Magnification of 30X is required for best appreciation of the crystallization, on all specimens.  The accompanying photos were taken with a Dino-Lite digital microscope.

Chemical composition is:  Ba4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2



 

 

 

 

ITEM
NO.

NUMBER OF JONESITE
CRYSTAL SPRAYS

 SPECIMEN SIZE
(INCHES)

 SPECIMEN
PRICE

 

2959

1

1

1/2

3/8

$25.

 

2960

1

1 1/2

1 1/2

1

$27.

 

2961

2

3/4

3/4

3/8

$40.

 

2962

2

3/4

1/2

1/8

$35.

 

2963

3

2 1/4

1 3/4

7/8

$65.

 

2964

2

3

2 3/4

1 3/8

$40.

 

2965

3

3 1/8

2 7/8

1 1/2

SOLD





 


2963A

2963B

 

2963C

2964A

2964B

2965A

2965B

2965C

2449 FRONT
2449 BACK

2450 FRONT

2450 BACK

PENTLANDITE
Strathcona Mine, Levack Township, Sudbury District, Ontario, Canada

The Strathcona Mine is perhaps the best known of several mines in the Sudbury district.  It is primarily a nickel mine, with workings in excess of 4,000 feet deep (> 1,100 meters).  Minerals present on the specimens illustrated below include varying amounts of Pentlandite, Chalcopyrite, Millerite, and / or Pyrrhotite, without rock matrix.  Item  2449  also has a ~ 1” (2.5 cm) circular inclusion of black crystalline / massive Sphalerite. 

 The Sudbury district is also known as the Sudbury nickel irruptive, and in some literature as the Sudbury astrobleme.  Astrobleme is a geological term given to this ancient weathered impact structure, meaning "star wound."  The immense Sudbury ringed structure, 60 km long and 27 km across, is thought by some researchers to be the remnants of a ringed structure produced by a direct blow delivered courtesy of one of the largest asteroids / bolides ever to have impacted this planet.  Approximately 1.87 billion years ago, give or take a few millennia, a cataclysmic event of almost unfathomable proportions took place a few kilometers north of present day Sudbury, Ontario, Canada.  This event, involving a gigantic, approximately nine kilometer diameter asteroid / bolide, traveling at 30 kilometers per second, slamming into the earth with an impact force equivalent to the detonation of several billion tons of TNT, caused a ring of mainly blast debris and fallout material to form around the upper portions of its original crater.  The resultant deposition of ore minerals provided one of the world's richest and most diverse Ni-Co-Cu deposits, buried below the structure.  For additional background information on this unique deposit, please see the following:

 http://esci.unco.edu/faculty/morrow/TOC%20Course/Sudbury_talk_abs.htm

 Gram weights are given as a measure of size – the specimens are not priced by the gram. 

 

ITEM NO.

 

WEIGHT
(GRAMS)

SPECIMEN SIZE(INCHES)

SPECIMEN
PRICE

 

2449

382.90

3 1/8

2 1/4

2 1/8

SOLD

 

2450

670.60

3 1/4

2 1/2

2 1/8

$320.

 

2451

793.90

3 1/2

2 1/2

2 3/8

$350.

 


2451 FRONT

2451 BACK

A.

B.

PENTLANDITE
Onaping Mine, Sudbury District, Ontario, Canada

The Onaping Mine was a nickel mine, closed in 1982. These specimens consist of varying amounts of metallic bronze color Pentlandite and metallic bronze-brown color Pyrrhotite, with minor Chalcopyrite.  In some areas, the Pentlandite can be seen surrounding “eyes” or cores of Pyrrhotite.  The specimens below were obtained from a private collection, not recently mined.  The dark colored matrix is typical of specimens from this vicinity.  All have been cut with a lapidary saw to expose the texture / richness of the ore. The structure of the ore is easier to see over the cut surfaces, and the minerals are very easy to identify over the cut surfaces because of their distinctive metallic colors and cleavage, or lack of it.  Item A. has been cut on three sides, and polished.  Item B. is an end cut, with a natural back.  Items C. and D. are slices.

 

 

MI-1233

WEIGHT
(GRAMS)

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

A. 

45.90

2 3/8

3/4

3/4”

SOLD

 

B.

152.65

4 1/2

3 1/4

12 mm

SOLD

 

C.

348.70

6 1/4

3 1/2

10 mm

$   85.00

 

D.

364.70

6 1/4

2 3/4

10 mm

$   90.00


C.

D.

A.

B.

CHALCOPYRITE / PENTLANDITE
Copper Cliff North Mine, McKim Township, Sudbury District, Ontario, Canada

Two beautiful cut specimens of the Chalcopyrite / Pentlandite ore from the Copper Cliff Mine were recently acquired from a collection of Canadian minerals.  As illustrated in the accompanying photos, the rich metallic golden-brassy color massive Chalcopyrite has included veinlets of darker, metallic bronze color Pentlandite.  Item A. has one cut surface, and a natural back.  Item B. has two cut surfaces.
 

 

 

MI-1237

WEIGHT
(GRAMS)

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

A.

222.80

5 1/4

1 5/8

3/4”

$  55.00

 

B.

 218.80

5 7/8

2 1/8

8 mm

$  55.00


2779

2780

2781

2782

MILLERITE
McCreedy West Mine, Levack Township, Sudbury District, Ontario, Canada

The Millerite from the Sudbury District is very unusual, exhibiting bright metallic golden-brassy cleavages (not hairy!).  Incredible ore specimens!!!  Similar to the mineral assemblage from the Strathcona Mine, with bright metallic golden-brassy Millerite cleavages, these specimens are combinations of massive Millerite exhibiting small, very bright metallic golden-brassy cleavages.   Some specimens have very minor amounts of metallic bronze color Pentlandite, and / or metallic bronze-yellow color Chalcopyrite, as illustrated.  The gram weights are given as an aid in evaluating the sizes of the specimens.  Pricing is not relative to the gram weight.  Since it is such a large specimen, item 2788 has the measurements given in inches as well as in cm.  Translated into pounds, the 3,700.00+ gram specimen weighs 8 pounds, 3 ounces of nearly pure Millerite, NiS!

 

 ITEM
NO.

 WEIGHT
(GRAMS)

 SPECIMEN SIZE
(INCHES)

 SPECIMEN
PRICE

 

2779

14.30

3/4

3/4

5/8

SOLD

 

2780

29.10

1 1/8

1 1/8

1/2

SOLD

 

2781

32.85

1 3/8

1

5/8

SOLD

 

2782

103.20

2

1 1/4

7/8

$   85.00

 

2783

115.50

1 3/4

1 1/4

1

$   95.00

 

2784

181.85

2 1/4

1 1/2

1 1/8

SOLD

 

2785

233.50

2 3/8

1 5/8

1 3/8

SOLD

 

2786

335.40

2 1/4

1 3/4

1 3/4

$  200.00

 

2787

813.35

4

2 1/2

2 5/8

$  425.00

 

2788

3,700.00+  8 lbs., 3 oz.

7”      18.0 cm

5 1/2”  14.0 cm

2 3/4”  7.0 cm

$1,275.00


2783

2784

2785

2786

2787

2788



                            MORE RARE MINERALS  PAGE 1 2 3 4 5 6 7 8

Copyright 1998-2020 by Mineralogical Research Co.
All rights reserved.