 | | Journal (issue) | | scintillating colors of Australian opal come to us through the courtesy of the Opal Spectrum company. For details...Our Cover feature. And, for a fascinating look at opal mining , plus more pictures, turn to page 8. AND...TX 78745 4 - JANUARY 1977 HOW TO CUT BRAZILIAN OPAL lapidary techniques for a new material by W.L Maison...and Barbara Thomas 32 TIPS ON BUYING AND CUTTING OPAL Advice from the professionals 34 ART NOUVEAU Easy-to-do...Gunther FEATURES 8 COO BER PEDY TODAY A visit to the opal mines by Lee Cross 15 INTERNAL STRUCTURES AND |  | | Book (edition) | | hi the reno- rations }iavf‘ luM^n introduced, an im- been adopted, tlie talde for the and tln^ chapter... 1 . SiLDLVTLS. SILICA. TAGB Quartz 2 dd Opal 23 b * 2 Ceil oral . SILICATES. Remarks 212... MINERALOGY. Minerals. Minerals nT(‘, llio plants an...portant for (h(‘ imdal they (‘ontain. gentn-ally in an impure state from ili(‘ |)i'^"s<,!uee of oilier minerThe...tlak(‘S when it snows; the stre.ams bia^ome coated with an aggregation of crystals called ico and wnudows are |  | | Book | | your own tumbling and grinding machine to cutting an emerald! The extensive reference section describes...a... “he experienced lapidary for whom it will be an invaluable work of reference. LIBRARY CHICAGO PUBLIC...eft: Magnificent hexagonal crystals of chalybite, an iron This book has several purposes: to introduce...are visible represent the form of the crystals at an earlier stage in their development fashioned gems;...things, such as the wings of butterflies, can show an incomparable purity and brightness. In this connection | | | Book | | your own tumbling and grinding machineto cutting an emerald !The extensive reference section describes...mineral-collector and the experienced lapidary for whom itwill be an invaluable work of reference. FOKRieterehee 543...Left: Magnificent hexagonal crystals of chaiybite, an iron carbonate. The triangular 'growth shadows' that...are visible represent the form of the crystals at an earlier stage in th eir de veiopm en t This book...things, such as the wings of butterflies, can show an incomparable purity and brightness. In this connection |  | | Book | | and have made virtually no use of fluorescence as an aid to identification. In this book, the fluorescent...each color—enable the user to turn his UV lamp on an unknown mineral, note its glowing fluorescence, and...contribution to science. A special acknowledgment to an ultra-violet pioneer THOMAS S. WARREN of San Gabriel...take with them into rough country. Pioneering in an uncharted field, he worked out circuitry, designed...eo sia - 2. as Abe DAs ee Se 6 ws ae nahi an<. Cee et a a ez -@, ae a bam =i Sao» | | | Book | | and have made virtually no use of fluorescence as an aid to identifi- cation. In this book, the fluorescent...each color—enable the user to turn his UV lamp on an unknown mineral, note its glowing fluorescence, ...probing deeper A special acknowledgment THOMAS to an ultra-violet pioneer S. WARREN of San Gabriel,...take with them into rough country. Pioneering in an uncharted field, he worked out circuitry, designed...meet . . . calcite, aragonite, 6—Agate, chalcedony, opal, fossil bone, geodes, “thunder eggs,” 7—Prime hunting |  | | Book | | Phisicke, 1601. Theophrastus's History of Stones, with an English version by Sir edition, 1774. The American...sciences, demands industry and attention and to become an accomplished mineralogist much and carean acquaintance...importance. It is true minerals frequently occur in an amorphous state ; in which case, the particles of..., or Rhombohedral. lateral axes, intersecting at an angle of 60°, and one vertical axis at right angles...the Diamond, and in a less degree by the Precious Opal. Change of Colours is of a somewhat similar nature |  | | Book (volume) | | Charing Cross Hospital. Pathologist to the London County Asylums. Fullerian Professor of Physiology at the...Association, 1887-1889. F. X. K. | Paralysis. j Ony*; [ Opal. Franz Xaver Kraus (1840-1901). Professor of Church...Formerly art-critic of the Saturday Review. Author of An Art Tour in the Northern Capitals of Europe; Schools...Historical Introduction to the Private Law of Rome, and of an edition i of the Institutes of Gaius and Rules of...Professor of Semitic Languages, University of Pennsylvania. of the Babylonians and Assyrians; &c. M. M |
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