= Fluorescent Specimen
Cuchillo Parado, Chihuahua, Mexico
This attractive specimen is composed of bright green stalactitic and botryoidal Malachite, without rock matrix. The longest stalactites are 1/2" and 5/8" in length, and five have hollow tips.
Size: 2 1/4" tall X 1 1/2" wide X 7/8" thick.
Order Item MS-011 Price: $45. Discount Price: $30 SOLD
Great Salt Plains, Alfalfa County, Oklahoma
Nice large display piece -- a radially structured aggregate composed of more than 25 large bladed crystals of reddish-tan color Gypsum, without associated rock matrix. The largest crystal on the specimen is 2 3/8" long, 1 7/8" wide, and 1/2" thick.
Order Item MS-012
Size: 5 1/4" wide, 3 3/4" high, 3" thick.
List price: $60.00 Discount price: $40.00 SOLD
Shangbao Mine, Leiyang, Hunan Province, China
Transparent, light green Fluorite has formed a multi-stepped intergrowth of cubic crystals, on matrix. The large group of multi-stepped Fluorite cubes measures 1 5/8" X 1 1/2" across. Much of the matrix has been covered with pearly white, curved ("saddle shaped"), Dolomite rhombohedrons. The Fluorite is fluorescent weak purple under SW UV, and dark purple under LW. Phos: none.
Size: 3 1/4" X 2 1/4" across, X up to 1 1/2" thick.
Order Item MS-013
List Price: $40. Discount Price: $25. SOLD
|QUARTZ - Chalcedony
Minas Gerais, Brazil
Chalcedony is a variety of Quartz which is usually found as irregularly shaped, rounded, botryoidal, and/or sometimes stalactitic forms. This very attractive, light pink mass of banded Chalcedony has several large flattened, botryoidal formations which show distinct color banding from pale pink, to near white. The top-front of the specimen has a shallow, open cavity in which the banding shows a complete, concentric formation. The inside of the open cavity is lined with a druse of colorless, micro Quartz crystals. The back of the specimen also shows the pale pink, to near white concentric banding -- no rock matrix. About 25% of the base of the specimen is hollow. UV fluorescence is yellow-green under both SW and LW, with SW giving a much stronger response. Phos: none.
Specimen size: 4 7/8" wide, 4 3/8" tall, and 1" thick at the base.
Order Item MS-014 List price: $60. Discount price: $40. SOLD
|"MINERALS OF THE WORLD" - by
"Minerals of the World" is an up-to-date guide to more than 500 of the best-known minerals from worldwide localities. Available in soft cover, the book is 6" X 9", with 439 pages. The succinct text covers the fundamental aspects of mineralogy -- crystallography, physical and chemical properties, names and varieties, structure, diagnostic features, and occurrence. The discussion of less common minerals, not found in other guides, makes this an invaluable resource. With over 600 exquisite color photographs, plus crystal drawings and crystallographic diagrams, this book is unequaled. It is set to become the field guide of choice for mineral collectors and students of mineralogy, and will provide a valuable addition to the library of anyone who studies mineralogy and mineral specimens. The extremely useful identification tables at the back of the book include the name of the mineral, chemical composition, habit, cleavage, brittleness, hardness, density, color, and streak. Other basic data included: the periodic table of the elements, symbols and atomic numbers of selected elements, a comprehensive glossary, and a 10-page index. Published by the Princeton University Press, 2002.
The author, Ole Johnsen, is Curator of the Geological Museum at the University of Copenhagen, Denmark. He has written numerous articles on minerals in popular and scientific magazines and periodicals, and has served on the committees of national and international organizations including the International Mineralogical Association (IMA) and the Mineralogical Society of America (MSA).
Copyright 1998-2016 by Mineralogical Research Co.
All rights reserved.