OTTER LAKE PQ POTIAC REGION.
348 PROCEEDI NGS OF SOCIETIESAs stated above, the stones were subsequently examined in lots, bymeans of appropriate optical equipment. Only those diamonds whichwere nearly free from strain or showed no evidence of this condition werechosen. Industrial diamonds, which were flawed or which contained inclusions of any kind which were so oriented in the stones as to cause possible failure on use, were eliminated from consideration. And lastly, anystone not properly cut was likewise unacceptable.Where a large number of stones are used, the employment of an inspection system, along the lines suggested above, and performed preferablyby an individual possessing some knowledge of the mineralogy and cr1'-stallography of the diamond, will do much to reduce replacement costs andunsatisf actory performance.PROCEEDINGS OF SOCIETIESTHE PHILADELPHIA MINERALOGICAL SOCIETYAcademy oJ Naturol Sciences oJ Philadelphi,a, December 5, 1910Dr. Thomas presided, with 52 members and visitors present Dr. Daniel L. O'Connellof the College of the City of New York addressed the Society on "The Saurel Symbols forthe 32 Crystal Classes." By the use of only a center of symmetry, ares oI symmetry, andinversion axes (planes of symmetry were ignored) a thoroughly consistent and logicalscheme for deriving and designatingthe 32 crystal classes was developed by the late P.Saurel, Professor of mathematics in the College of the City of Neiv York. The exposition ofthe system by Dr. O'Connell was discussed by Drs. Wherry and Patterson.fanuory 2, 1911Dr. Thomas presided with 47 mernbers and visitors present. Dr. George T. Faust ofthe U. S. Department of Agriculture spoke on "Economic Petrography," emphasizing theimportance of petrographic analysis in planning methods for beneficiation of ores. Mr.Louis 1\'foyd related some experiences on his mineralogical expedition into Ontario inNovember,February 6, 1941Dr. Thomas presided, with an attendance of 71 members and visitors. Dr. WilliamParrish of State College addressed the society on "Isomorphism and solid solution," inwhich data on atomic and ionic radii and their relation to codrdination numbers were reviewed. Interstitial and substitutional solid solutions and the formation of stable compounds were discussed from the vielvpoint of crystal chemistry and structure. They canbe differentiated by specific gravity methods and r-ray studies. Factors influencing theformation of solid solutions such as the lS/q rule (limit of tolerance of radii of replaceable atoms), close similarity in crystal structures, etc., were discussed Ordered, disorderedstructures and superstructures were described. Some of the principles deveioped were iilustrated in deriving chemical formulae from chemical analyses of sphalerites and spinel. Thespeaker stressed the importance of the study of compositional variation in mineralogy.Mr. Louis Moyd exhibited peristerite and ellsworthite from Hybla, Ontario; cyrtolite,cancrinite, sodalite, biotite, hackmanite and nepheline from Bancrof| c1'rtolite andtrernolite from Otter Lake; calcite, fluorite, diopside, molybdenite, and fluorite from Wilberforce; and wernerite from Calumet, OntarioFonnrsr L. LeNrnn, Secretary
http://www.geocities.ws/hopart/MINERALOGIC/EmeraldBe3Al2SiO3x6is7.5Mohs.html Quakes!
Apatite A beautiful big teal apatite with two different habits (and colors) of calcite from Sludyanka, Baikal Lake, Russia.
Thanks to Rick & Deana Seng's auction on eBay for the specimen and images! ApatiteMineral Collection Images LOCATION RESOURCE
Apatite A beautiful big teal apatite with two different habits (and colors) of calcite from Sludyanka, Baikal Lake, Russia. Thanks to Rick & Deana Seng's auction on eBay for the specimen and images!
blue rox! --
Massive ceruléite in matrix from the type locality of the Emma Luisa Mine, Guanaco, Taltal, Chile, can be cabbed for jewelry - this copper aluminum hydroarsenate miniature is a beautiful distinctive blue. The larger image shows an unidentified bluish-green mineral in a small vug and a smaller ceruléite-filled "sandwich".
Thanks to the House of Onyx for the specimens!
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