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MINERAL SPECIMENS FOR DISPLAY


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= Fluorescent Specimen
  = Radioactive Specimen

 


2065

2066

CASSITERITE
Viloca Mine (Araca Mine), Loayza Province, La Paz Department, Bolivia

The Viloca Mine is well known as a source of lustrous, twinned, well developed, dark brown Cassiterite crystals.  Item 2465 is a cluster of 5 or more dark brown twinned crystals, the two largest each 1/2” in length, in an intergrown group without matrix.

Item 2466 has more than 5 lustrous, dark brown Cassiterite crystals on crystalline white Quartz matrix.  The largest Cassiterite crystals are 5/8” and 7/8” long, and 3/8” to 1/2” wide.  Several 1/4” terminated Quartz crystals are clustered around the base of the Cassiterite crystal group.

 

 

ITEM

WEIGHT(GRAMS)

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

2465

19.25

3/4

3/4

1/2

SOLD

 

2466

57.85

1 1/4

1/1/4

1

$  95.00


2467

2468

CASSITERITE
Huanuni Mine, Huanuni, Dalence Province, Oruro Department, Bolivia

The Huanuni Mine is the world’s richest Cassiterite deposit.  The two specimens available from this locality each have well-developed, very lustrous, black-brown terminated Cassiterite crystals as shown in the accompanying photos.

Item 2467 is a knob-like intergrowth covered on all sides with numerous extremely lustrous, very sharp, black-brown Cassiterite crystals up to 1/2” on an edge, without matrix.  A very minor amount of pale tan color Siderite has formed scattered micro crystals, present around one side and the base of the specimen.

Item 2468 has more than 50 individual, dark black-brown terminated Cassiterite crystals protruding in all directions from the front of the specimen.  The average crystal size is 1/4” to 3/8”, and the two largest crystals are each 1/2” in length.  Prismatic white Quartz crystals and Quartz crystal sections can be seen scattered around among the Cassiterite crystals.  The largest terminated Quartz crystal, protruding from the top of the specimen, is 5/8”+ in length. 
 

 

ITEM NO.

WEIGHT
(GRAMS)

SPECIMEN SIZE
(INCHES)

SPECIMEN
PRICE

 

2467

58.0

1 1/8

1 1/8

1

$ 120.00

 

2468

150.0

2 3/8

1 5/8

1 1/8

$ 145.00


2469

CASSITERITE
Emmaville, Gough County, New South Wales, Australia

The tin mines of the Emmaville district were worked before 1882, according to information provided on MINDAT.  The specimen illustrated here is an intergrowth of lustrous, dark brown-black terminated Cassiterite crystals without matrix.  It is temporarily mounted in a plastic Perky Box using water soluble glue.

Specimen size:  1/2” X 3/8” across X 1/4” thick
Order item 2469
Price: 
SOLD


2470

SCHEELITE
Pingwu Beryl Mine, Mt. Xuebaoding, Pingwu County, Mianyang Prefecture, Sichuan Province, China

Two large, sharp, light tan color pseudo-octahedral Scheelite crystal intergrowths, with slightly curved faces, are in a group without matrix.  The crystals are 1 1/4” and 1 3/8” tall, and each is 7/8” wide.  The back of the specimen is rough, where the specimen was attached to the wall of the pocket in which it was formed, i.e., there is no matrix.  Minor micro Muscovite and Albite crystals are present, formed as a secondary deposition between the two large Scheelite crystals at the top of the specimen, as oriented in the photo.  UV fluorescence:  very bright yellow-white under SW UV only.  No phosphorescence.

Specimen size:  1 1/2” wide, 1 3/8” tall, 7/8” thick
Gram weight:  90.0 grams
Order item 2470
Price:  $110.00 
SOLD

mi1050a.jpg (81929 bytes)
A.

mi1050b..jpg (88727 bytes)
B.

mi1050c.jpg (64211 bytes)
C.

mi1050d.jpg (35287 bytes)
D.

mi1050e.jpg (41757 bytes)
E.

mi1050f.jpg (61426 bytes)
F.

mi1050g.jpg (56966 bytes)
G.

 

QUARTZ – “Herkimer Diamond”
Middleville, Herkimer County , New York

The area around Middleville , New York is world renowned for its water clear, double terminated Quartz crystals, called “Herkimer Diamonds”.  These specimens have been selected because of their interesting inclusions.  Please note that, on all specimens, the inclusions must be viewed with 10-30X magnification for best appreciation.  The inclusions characterized below have been marked on each specimen with red tape arrow pointers.  The tiny red arrow pointers can be removed with tweezers, if you prefer, after you have familiarized yourself with the internal inclusions and their respective locations within the crystal.  Please note that many hundreds of crystals have been laboriously checked with a microscope to locate and characterize these few crystals with inclusions.   Special features noted within the “Herkimer Diamonds” from the Middleville area are described below.  Pricing is relative to the external perfection of the crystals, as well as to their clarity and amount of special features present.  The field collectors in Herkimer County , New York , who work to recover these specimens, place the highest value upon the moveable and stationary bubble inclusions because of their higher degree of rarity than the other types of inclusions.  All specimens are 100% complete, double terminated, externally perfect crystals with the exception of items B., C., F., and G. which have minor external imperfections, i.e., tiny points of contact where the crystals were attached to the wall of the pocket, during formation. None of the crystals have matrix.  Item F. has two crystals in penetration, so the dimensions of both crystals are given in the table below.

1. Liquid inclusions (LI), i.e., water in the form of a saline solution.

2. Gas inclusions i.e., gases entrapped in tiny cavities, or in negative crystals within the larger parent crystal.  The gas inclusions can generally be seen as tiny moveable bubbles (MB) or stationary bubbles (SB) within the cavities.  The number in (   ) after the letter abbreviation is the quantity of that type of inclusion or feature that can be found within the crystal.  (S) indicates several inclusions are present.

3. Anthraxolite inclusions (A) – small included particles of irregularly shaped, black carbonaceous material.  Anthraxolite is a hydrocarbon mineral, and is often fluorescent yellow-green.

4. Negative crystals (NX), i.e., inclusions which have the form of microscopic, euhedral, double terminated Quartz crystals suspended within the larger parent crystal.

5. Other misc. inclusions (OI) as microscopic, elongated or irregularly shaped voids without specific form.

 

 

MI-1050.

SPECIMEN SIZE
(INCHES)

SPECIAL FEATURES

SPECIMEN PRICE

A.

3/4

5/8

1/2

LI, SB (2), NX,  A

SOLD

B.

3/4

5/8

5/8

NX, A, OI

SOLD

C.

5/8

3/8

3/8

SB (1), NX (3), A

SOLD

D.

3/8

1/4

1/4

LI, MB (2), NX

SOLD

E.

3/8

3/8

1/4

NX (S), A

SOLD

F.

1/2
1/2

1/2
1/2

3/8
3/8

A, OI

SOLD

G.

7/8

3/4

5/8+

SB (2), A, OI

SOLD

 

 

 

 

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