= Radioactive Specimen
|QUARTZ – Japan Twin
Flor de Peru I Claim (Tentadora Mine), Mt. Ullpac, Pampa Blanca, Castrovirreyna District, Huancavelica Province, Peru
Yes, Japan law twinned Quartz crystals are found at many localities, worldwide. One matrix specimen, and several single crystals, are available.
The matrix specimen has a single Japan twin crystal of Quartz 1" tall X 7/8" wide, standing upright on the right side of the specimen. More than 10 individual terminated Quartz crystals, up to 1/2" in length, are also scattered over the surface of the matrix.
Specimen size: 2" X 1 1/2" across the base of the specimen, X 1 1/4" tall.
Order Item MI-031A Price: $90.
The single Japan law twinned Quartz crystals are all non-matrix specimens, as individually illustrated. In the table below, the dimensions are given: height, width, and thickness at the base of the crystal. Order item No. MI-031B through F.
Champion Mine, White Mountains, Mono County, California (Dana & type locale)
The three specimens illustrated here are from a find made in 1995, attesting to the fact that "old localities" (the Champion Mine was first worked in the 1920’s) should not always be presumed "worked out"! For background information on this important California locality, refer to the "Mineralogical Record" magazine, 8:478 (the Nov-Dec 1977 California special issue). Woodhouseite has formed very sharp, light yellowish-tan to yellow-golden color pseudocubic, trigonal crystals on Quartz matrix. Each specimen has numerous extra sharp Woodhouseite crystals present, associated with small, prismatic, translucent-white to colorless, terminated Quartz crystals. The number of Woodhouseite crystals present exceeds 20 on item A., while item B. has more than 50 crystals present. Items C. and D. each have more than 100 crystals present! The matrix on item A. is in natural condition, while items B., C. and D. have saw cuts. Item C. has 3 saw cuts, and items B. and D. each have 1 saw cut. It was necessary to saw the Quartz matrix on the large specimens to preserve these specimens in total, rather than taking a chance on hand trimming methods which might have caused the large crystal covered surfaces to break into many smaller, less desirable specimens. Specimens with large, crystal covered surfaces such as this are very uncommon.
Sarbay-Sokolov, Kazakhstan, Russia
Four translucent-transparent, light yellow-honey color Calcite crystals form an attractive grouping, with a small amount of matrix at the base of the Calcite crystal group. The largest Calcite crystal measures 2" wide, 1 3/4" thick, and 1 3/8" tall. Minor Chalcopyrite and Galena are intergrown with the matrix.
Size: 2 1/4" X 2 1/4" X 1 3/4"
Order item MI-033 $90. SOLD
Morenci Pit, Copper Mountain, Morenci, Greenlee County, Arizona
Numerous thick, coarse bladed Azurite crystals form dark midnight blue color, three-dimensional Azurite "roses", crystallized on all sides, without rock matrix or point of attachment. Item A. is a compact group of intergrown, bladed Azurite crystals. Item B. is a double terminated single crystal (not a "rose"). Items C. and D. are dark midnight blue color, classic three-dimensional Azurite "roses". For background information on this occurrence, see the "Mineralogical Record" magazine, Jan-Feb 1973, P. 5 (text), and P. 34 (Fig. 4), as well as Jan-Feb 1991, P. 66-67. Also see "Mineralogy of Arizona", Third Edition, P. 44-45 (history, and P. 125 (occurrence of Azurite). The specimens listed below were collected circa April-May 1996.
Copyright 1998-2020 by Mineralogical Research Co.
All rights reserved.