 | | Report (volume) | | and pegmatites .................::eee eee 310 Occurrence. aiid. COMPOSITION. sks; iccanens teas soc ten...pegmatites.................:.seeceee noes 314 Occurrence and Conmmpositione. ie o.seten cant howe tides...c1c, (cnc 85 PS Ca OT eeeeeds aa esetacenae 314 Occurrence ahd: COMPOSIION: . sss .0csc00cescusaaceeGersbuassceems...Lscoutsauvenevab bonddeassve0sbeeeres anes 320 Occurrence and compositions cee ae 2.0. Hekate ae ween tedasess...eset, SMe o>. Tourmaline stability in magmas: Dravite...................:cceeeeeeeeeeees Tourmaline stability | | | Report (volume) | | Carbonate-borates Beryllate borates Silicate-borates The Occurrence of FBBs in Borate Minerals Some General Observations...Magnesiodumortierite Alkali-free dravite Complex tourmalines Dravite Uvite Elbaite Highly aluminous tourmalines...in the borders of granites and pegmatites 310 Occurrence and composition 310 Significance 313 Disseminated...Disseminated tourmaline in granites and pegmatites 314 Occurrence and composition 314 Significance 314 314 Tourmaline...Tourmaline in miarolitic cavities Occurrence and composition 314 Significance 317 Breccias and veins within |  | | Book (edition) | | Tourmaline Corundum [Biotite] [Biotite] Dravite Dravite Schorlite Tourmaline Tourmaline Apatite ...Analcime r Schorlite c | Lawsonite r Lamprobolite ce Dravite c Dumortierite r |Sphene c Chabazite c Epidote...Glaucophane (110)P Wollastonite (100)P(001)D | Diopside (110)P Hornblende (110)P Grunerite (110)P Pigeonite...a Enstatite - 590-1 .612 Alunite 1.650-1.698 a Diopside - 592 Chondrodite 1.651-1.668 a Spodumene . 592-1...Glauconite 1.664-1 .686 y Cummingtonite -610-1.644 Dravite 1.665 a@ Lawsonite -613-1.628 Anhydrite 1.667-1 |  | | | | yellow, brittle, with a greenish black streak. Occurrence It is found in placer deposits leftby erosion...black in colour, and the streak is brownish red. Occurrence Native copper crystallizes from hydrothermal...Columbia. Other Localities: Kongsberg, Buskerud, Norway, is the most famous locality for “horn” and “wire”...is often tarnished to a grey or black colour. Occurrence Platinum occurs as blebs or rounded inclusions...bismuth is silver-white, sectile with no cleavage. Occurrence Bismuth is rare. It occurs in veins formed by |  | | Book (edition) | | (lnosilicates) 341 Pyroxene Group: Enstatite Hypersthene Diopside Augite Pigeonite Hadenbergite Aegirine-Augite...stereographic net showing the optical orientation of diopside ( upper he1nisphere). The crystallographic a....are inorganic chen1ical compounds of natural occurrence. With exceptions such as native n1ercury, n1inerals...associations and environment as described under occurrence are often helpful. Experience has shown that...Scheelite [Chloritoid] "' "' [Biotite] [Biotite l Dravite Oravite Sti lpnomelane Stilpnomelane Schorlite |  | | Book | | yellow, brittle, with a greenish black streak. Occurrence It is found in placer deposits left by erosion...black in colour, and the streak is brownish red. Occurrence Native copper crystallizes fro1n hydrothennal...n,ucb harder and 111ore b1ittle than silver. Occurrence Silver is found in the late stages of crystallization...is often tarnished to a grey or black colow·. Occurrence Platinum occurs as blebs or rounded inclusions...bisn1uth is silver-white, sectile with no cleavage. Occurrence Bisn1uth is rare. Tt occurs in veins formed by |  | | Book (edition) | | seldom present, with a consequent infrequency of occurrence) tend to form smaller crystals. Common minerals...late low-temperature vein fillers. The usual occurrence and association is noted in the paragraph headed...species descriptions. Knowledge of the type of occurrence you visit helps to eliminate minerals that might...ruby corundum (where it is a lapidary hazard) and diopside. Tenacity: Crystalline masses vary in their resistance...simply crushing the mica plates with a needle. Occurrence: The inertness of gold and its high density causes |  | | Book | | second chapter, dealing with the genesis and occurrence of gem minerals, is followed by chapters on the...20 Covalent Bond 5 lonic Radii 2 Origin and Occurrence of Gemstones ...............5 Gems and Common...although they are like minerals in chemistry and occurrence. In a rigorous classification such substances...devices and methods are emphasized. ORIGIN AND ~ OCCURRENCE OF GEMSTONES* Although gemology is a relatively...chapter gives a brief account of the origin and occurrence of gemstones in nature. Man-made gems are considered |  | | Journal (issue) | | pocket there in 1958: “The first large scale occurrence of wulfenite that I observed was dike-like in...color and pseudocubic in habit—the only such occurrence in the mine of which I am aware. Altogether about...fuses about ten feet away from the wulfenite occurrence! Shortly after this trip, the small wooden headframe...4.6 cm, from western Hardangervidda, Hordaland, Norway; collected in the 2000s. One pyramid face on the...7.5 cm, from western Hardangervidda, Hordaland, Norway; collected in 2005 from a small pocket yielding | | | Book | | second chapter, dealing with the genesis and occurrence of gem minerals, is followed by chapters on the...17 Ions and Chemical Bonding 20 2 Origin and Occurrence of Gemstones ............... . Gems from Solution...although they are like minerals in chemistry and occurrence. In a rigorous classification such substances...chapter gives a brief account of the origin and occurrence of gemstones in nature. Man-made gems are considered...0000005 0.0000005 u Ag Pt Au 8 ORIGIN AND OCCURRENCE OF GEMSTONES tated substances become rock when |  | | Report (Issue volume) | | unusual or especially fine specimens. Each mineral occurrence is followed by a brief description of the deposit...is quarried from a locality near th e original occurrence. Socialite from Princess Quarry at Bancroft,...hydrochloric acid. If you wish to make a record of the occurrence, include a notebook and pencil and a camera....of the road about 300 feet east of the first occurrence. Medicine Lake is situated east of Linklater...pits and trenches are now partly grown over. The occurrence is 1500 feet from the Canadian Pacific railway |  | | Book | | other in a mineral are written so (Mg.Fe). Field occurrence Nearly all rocks are composed of minerals, but...brittle nature of the other two. Alteration None. Occurrence In small amounts in hydrothermal veins, often...tarnish, malleability, soluble in nitric acid. Occurrence In hydrothermal veins, or in small amounts in...ductility, readily soluble in nitric acid. hedra!. Occurrence In basaltic lavas and in sandstones and conglomerates...like garlic when heated or struck with a hammer. Occurrence In hydrothermal veins, usually in igneous and |  | | Book (edition) | | Rhodochrosite, W illemite, Sphene, Augelite, Scheelite, Diopside, Tremolite, Augite, Scapolite, Tugtupite, Hemimorphite...Scheelite crystal in matrix, Mexico Drawing of diopside crystal forms Heminiorphite specimens, Mexico...Phoenix. 9. Grossular garnet crystals, with diopside, lining vug in rock fromJeffrey Mine, Asbestos...of magnesian ilmenite and one sample of chrome-diopside. Brown, Bennett, and George (ibid.) review previous...for their minerals but also for their mode of occurrence, which presents important differences compared |  | | Report (issue) | | Reference . . . . . . Report References. . . . Occurrence. . . . . . . . . Associated Minerals . . . ROM.... . . . . . . . . . . . . . . . . . . . . . . Diopside . . . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . . Dravite .................................................township names are misleading, as the actual occurrence, prospect, or mine was in an adjoining township...Introduction. The various headings used to describe each occurrence are discussed more fully below. SPECIES NAME | | | Book | | other in a minera l are written so (Mg.Fe). Field occurrence Nearly all rocks are composed of minerals. but...brittle nat ure of the other two. Alteration No ne. Occurrence In small amounts in hyd rothermal veins. often...tarn ish, malleability, soluble in nitri c acid. Occurrence In hydrothermal veins, or in sma ll amounts in...ductility, read ily so luble in nitric acid. Occurrence In basaltic lavas and in sandstones and cong...like garlic when heated or struck with a hammer. Occurrence In hydrothermal veins. usually in igneous and |
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