= Fluorescent Specimen
= Radioactive Specimen
The occurrence of pseudo-bipyramidal Quartz crystals at the Sovietskiy #2 Mine is mentioned in the special Dal’negorsk issue of the “Mineralogical Record” magazine, Vol. 32, P. 26-28. These unusual, translucent, very sharp Quartz crystals have no prism faces, and average ~ 3/8” up to 1” in size. The size of the largest crystal on each specimen is given in the table, below. The individual pseudo-bipyramidal crystals are intergrown, forming clusters of attractive miniature to small cabinet specimen size, with little or no matrix. Occasional inclusions within the Quartz crystals are acicular needles of Hedenbergite. The specimens are actually much more attractive, than the photographs reveal.
Item MI-1596 has about 20 colorless, elongated, scalenohedral Calcite xls. standing up all over the surface of the matrix, encircling the large Quartz crystal like a crown. A single, very large (1 1/2” diameter), pseudo-bipyramidal Quartz crystal is perched on top of the group of Calcite crystals. The Calcite crystals average 1/2” to 3/4” tall, and are fluorescent bright pink-red under both shortwave (SW) and longwave (LW) ultraviolet.
The Kara-Oba Mine is a greisen tungsten-molybdenum deposit located in central Kazakhstan. It has produced some very fine Wolframite crystals in the past years, and is also known for well crystallized Bertrandite, Cosalite, and numerous other minerals. The specimen offered here is from the collection of the Fersman Mineralogical Museum in Moscow, with a museum label. The two terminated, parallel growth Wolframite crystals on the front of the specimen are striated, shiny black in color. The largest crystal is 1 5/8” tall, 1 1/4” wide, and 1/4” thick. The smaller crystal is 1 1/4” tall X 3/4” wide. Crystallized Arsenopyrite, Pyrite, and Quartz are associated. The largest Quartz crystal measures 1 1/4” in length X 3/8” wide, and is double terminated. A druse of micro Pyrite crystals coats much of the back of the specimen, including portions of the Quartz and Wolframite crystals. Very aesthetic specimen!
Specimen size: 1 5/8” tall, 1 3/4” wide, and 1
PSEUDOBOLEITE on BOLEITE
Amelia Mine, Boleo Copper District, Santa Rosalia, Baja California, Mexico
The Boleo Copper District is the type locality for both Pseudoboleite and Boleite. Pseudoboleite is always associated with Boleite, as an epitaxial overgrowth upon the face(s) of a cube of Boleite. See the idealized crystal drawings illustrating Pseudoboleite on Boleite in the "Mineralogical Record" magazine, Vol. 29, No. 1, P. 44, Fig. 44 (special Mexico I issue). The specimens offered here are not symmetrically perfect, as shown in the crystal drawings. They do, however, show the Pseudoboleite overgrowth on one or more of the Boleite crystal faces, similar to the drawing with the simple faces illustrated in the lower left corner of the "MR" reference, Fig. 44 as noted above. Color is dark royal blue, similar to the color of the specimen illustrated in Fig. 17, P. 61 of the "MR" reference. The tiny specks of orange-brown material shown in some of the photos, adhering to the crystals, are tiny specks of Montmorillonite clay – the host material in which the crystals were found. See P. 56 of the "MR" reference for information on the ore bed, and the varicolored Montmorillonite clay. Order Item MI-1070, items A., B., C., or D.
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