 | | Report (issue) | | OF MINERALS AND MINERAL LOCALITIES ALLANITE Inyo County: 1, Coarse grained allanite occurs in a pegmatite...quadrangle, McAllister (4) p. 52. Los Angeles County: Additional reference, Patchick (2) p. 237. This...diagrams. 1, AMPHIBOLES ACTINOLITE San Bernardino County: 3, Additional Wrightwood, reported by Berkholz...locality in alluvium, near 21. HORNBLENDE Inyo County: 1, In large prismatic crystals up to 2.5 inches...Panamint Range, McAllister (4) p. 52. San Bernardino County: 2, Pargasite variety of hornblende occurs in coarsely |  | | Journal (article/letter/editorial) | | Deposits of the Clear Creek Area, New Idria District, San Benito County, California1 U.S. Geological Survey,...jadeite were those in Tawmaw, Upper Burma; Kotaki District, Niigata Prefecture, Japan; and Motagua Valley...calc-silicate rim. (2) Jadeite veins cross-cutting albite-crossite schist inclusions. In these veins jadeite coexists...situated within the New Idria District, California (Fig. 1). This District is located in the southern extension...1. Index map showing location of the New Idria District, California. After Eckel & Myers (1946). 2- |  | | Journal (article/letter/editorial) | | Combridge CB2 3EQ. U K Abstract. New occurrences of crossite and jadeitic pyroxene are described from a thick...reactions and mechanisms involved in the breakdown of crossite and jadeitic pyroxene. Zones of albite and chlorite...chlorite, produced by reaction between crossite and paragonite, have been preserved due to sluggish reaction...actinolite, and of crossite to talc and actinolite are also described. The occurrence of crossite and jadeitic...during the Alpine collisional event. Key words: crossite; jadeitic pyroxene; reaction kinetics; reaction |  | | Journal (article/letter/editorial) | | replaced by the alternative higher density aegirine-talc assemblage; and (iv) glaucophane is stable only...a brown hornblende: Milton and Eugster, I959); crossite marks the lowest pressures of blueschist formation...diagram, with regard to the alternative pyroxene-talc mineralogy. (a) Pyroxenes. Compositions are now...9 assemblage of Na pyroxene+talc mineral; or alternatively albite + talc mineral with additional quartz...solid solution between the end-member pyroxenes and talc minerals (see below), it is possible to calculate |  | | Report (issue) | | a short article on California diamonds. Amador County: A few small stones have been picked up near the...the towns of Volcano, Oleta and Fiddletown. Butte County: In 1853 it was observed that diamonds occurred...been obtained from the placers It seems in this district and it leads all other districts in the State..."Wliite Rock canyon and at Smith's Flat. Fresno County Small diamonds are reported to have been found...found a few miles north of Coalinga. Nevada County A 1-^ carat stone was found at French Corral. Siskiyou |  | | Journal (article/letter/editorial) | | and tourmaline. Unorientated green amphibole and talc occur in rims and along fractures as secondary products...Naamphibole; less often, calcite and dolomite with talc locally occur in pseudomorphs after Na-amphibole...fractures within sodic amphibole. Sodic amphiboles are crossite and, less often, glaucophane (Table 2, Fig. 3)...Portugal. Epidote, chlorite, plagioclase, magnetite, talc The epidotes show compositions typical of other...minor TiO,; c. 3 wt%) is a widespread primary phase. Talc is subordinate and locally replaces sodic amphibole |  | | Journal (article/letter/editorial) | | ASWATHANARAYANA(U.), see RAO (V. DIVAKARA), 678 Auburn mine, Minnesota, stilpnomelane, 693 AUCOTT(J. W.), see...819; and see amosite, actinolite, crocidolite, crossite, cummingtonite, I97 hornblende, magnesioriebeckite...VANCE (E. R.), 605, manganese ores, 235 Bau mining district, Sarawak, Malaysia, anti721 monian idocrase, 894...), An antimonian idocrase from the Bau mining district, Sarawak, 894 BRICE (W. R.), see CHANG (L. L....province, Zambia, Mg-chlorite-kyanitequartz schist, talc-kyanite-quartz schist, kyanite-bronzite, gedritite |  | | Journal (article/letter/editorial) | | reaction of albite + actinolite + chlorite to form crossite + lawsonite; greenstones contain calcite, mafic...who identified glaucophane from a sample of Lake County, California schist exhibited at the Paris exposition...(Schlocker and cross-fiber chrysotile and brucite or talc. Redothers, 1954; Hertlein, 1956), generally re-...Andreas and Nacimiento blocks commonly exhibit a talc and/or actino- W. G. ERNST—FRANCISCAN METAMORPHIC...86A 152A Albite Aegirinc Actinolite Hornblende Crossite Lawsonite Pumpellyite Quartz White mica Chlorite |  | | Journal (article/letter/editorial) | | Gatooma-Hartley; (11) Gwanda; (12) Gwelo; (13) Lonely Mine; (14) Lower Gwanda; (15) Makaha; (16) Mashaba; (17)...successions are noted, viz. 12 km in the Bulawayo District (Amm, 1940), 24 km at Hunters Road, Gwelo (Macgregor...+ mica e p i d o t e in vesicles epidotisation talc + c a r b o n a t e antigorite + pargasite/edenite...Mafic chlorite + talc + tremolite breunnerite-bearing rocks m a g n e t i t e + talc + carbonate chlorite...actinolite chlorite + t r e m o l i t e talc + c a r b o n a t e talc schists tremolite/actinolite schists |  | | Journal (article/letter/editorial) | | 1982, PP. 87 99 The Laytonville Quarry (Mendocino County California) exotic block: iron-rich blueschist-facies...into underlying metadevelopment of the tremolite-talc exotic block rind basites across a contact only... Situated 8 km south of Laytonville (Mendocino County, California), the exotic block, originally 40 m...adjacent deerite. In Fe-rich metapelitic quartzites, crossite porphyroblasts, zoned from Fe 3+-rich cores to...the quasi-isochemical (K for Na) replacement of crossite cores by stilpnomelane is impossible unless the |  | | Journal (issue) | | geothermal lease sale held in January. . . .. Josephine County mineral study completed. . . . . .. 23 36 36...Mountain Schist which also contains glaucophane-crossite and stilpnomelane. The progressively metamorphosed...Geology, the presumption is that glaucophane and crossite ( ± stilpnomelane) are distributed more abundantly...among minerals of the ultramafic rocks define (I) a talc zone in which olivine and tremolite may also be...may be dependent on instability of the assemblage talc + olivine, and (3) an enstatite zone in which enstatite |  | | Journal (article/letter/editorial) | | changes from actinolite, through ferri-winchite and crossite, to barroisite and hornblende with increasing...magnesioriebeckite-riebeckite +crossite in the upper chlorite zone of lower-grade rocks; crossite or glaucophane+ barroisite...were compiled on [41AI-[B1Na + --- Winchite. Crossite Hornblende** Chlorite Biotite Garnet Albite Garnet...change from actinolite, through fern-winchite, crossite, to barroisite and hornblende in ascending order...Fgln, ferroglaucophane; Gln, glaucophane; Crs, crossite; Rbk, riebeckite; Mrb, magnesioriebeckite; I4lAI |  | | Journal (article/letter/editorial) | | locality is 9 km east of the Pinchi Lake mercury mine, on the Tezzeron Lake logging road. Samples labelled...analyses of amphibole, garnet, clinopyroxene, phengite, talc, titanite, rutile, and lawsonite are presented in...apatite; e = cummingtonite; f = Ba-A1 silicate; g = talc; j =chlorite; k = howieite; I =graphite; m = stilpnomelane...except for minor amounts of crossite in BLR-1 and BLR-2. In the TLR rocks. crossite is the most common amphibole...analyses of winchite and actinolite). In TLR-4, crossite rims magnesioriebeckite and glaucophane cores |  | | Journal (article/letter/editorial) | | Na-amphibole crossite (table 1) within Table 1. Chemical composition and atomic proportion of crossite from Arolla...elements used for subduction under stability of crossite also formed within the other units of the Pillonet...facies metamorphism by petrofabric arguments if the crossite is of early-alpine age. 2.2. M. T a n t a n 6...3T-phengite and other sheet silicates, (100) of alpine crossite and actinolite, long axes of these amphiboles...G). Stra is defined by preferred orientation of crossite and actinolite c-axes, of long axes of clinozoisite/epidote; |  | | Book | | 1958; SHIDO and MIYASHIRO, 1959); actinolite crossite (SUZUKI, 1930; DE ROEVER, 1947; DENGO, 1950; SEKI...producing it as a metastable breakdown product of talc; these authors were unable to demonstrate a stability... As indicated in Fig. 20, at low temperatures 9 talc 4 forsterite react to form 5 anthophyllite fluid...enstatite quartz fluid. The reaction anthophyllite = talc 4 enstatite involves a volume decrease, hence GREENWOOD...intermediate metastable product of the decomposition of talc at high temperatures. + + + + + 40 Phase |  | | Journal (article/letter/editorial) | | a r b a r a c o u n t y n o r t h t o Humboldt COunty. The glucophane areas are usually s m a l l i n...seen in a few places—notably in western Sonoma county w h e r e they more or less follow the zone Gf...entire length of the county. A few of the larger schist bodies in Sonoma county have estimated thickness...Rutile the formation of the glaucophane schists 10. Crossite 25. Sericite were usually either peridotite or...of peridotite such as saxonite, 12. Epidote 27. Talc pyroxenite, or dunite before their altera- 13. Fuschite |  | | Journal (article/letter/editorial) | | lawsonite, CaCO3, parago- nite, actinolite, crossite and iron oxide are analysed on an A 1 - C a -...lawsonite + crossite + paragonite = epidote + chlorite + albite+ quartz + H20 (2) lawsonite + crossite = pumpellyite...(3) crossite + pumpellyite + quartz = epidote + actinolite + albite § chlorite + H20 (4) crossite + epidote...the appearance of an extra Mg-rich phase such as talc. Because FeZ+/Mg partitioning is not precisely equal...paragonite, Hem hematite, Rieb riebeckite, Cross crossite, Glauc glaucophane, Act actinolite, Hbld hornblende |  | | Book (volume) | | hypersthene—diopside—plagioclase hornfels, Aavold Quarry, Oslo district, Norway (Muir and Tilley, 1958). Anal. J. H. Scoon...thermally metamorphosed iron-rich rock, Yu hsi kou district, Manchuria (Tsuru and Henry, 1937). Anal. N. F...5MgSi03 + H20 talc forsterite enstatite (OH)2Mg3Si4Oio ^ 3MgSi03 + Si02 + H20 talc enstatite 2G...reactions is in equilibrium with serpentine and talc at 15,000 lb./in.2 water vapour pressure: (OH)4Mg3Si205...(OH)4Mg3Si205 + (OH)2Mg3Si4Oio ^ 6MgSi03 + 3H20 serpentine talc enstatite Under certain water deficient conditions |  | | Journal (article/letter/editorial) | | Epidote Sursassite Ardennite Spessartine Braunite Crossite/Mg-Rieb. Hematite Rutile Titanite Evvia 79 255...restricted to a separate layer containing quartz, crossite, and hematite) Table 2. Characteristic assemblages...and chlorite occur (Table 2, Fig. 2a). Accessory crossite, phengite, ardennite, rutile, titanite, albite...- rutile _+phengite. - Accessory minerals are crossite, ardennite, albite, tourmaline, apatite, and rare...hematite, braunite, chlorite, phengite, ruffle, and crossite. In spessartine quartzites (e.g. A n d 79-425 |  | | Journal (article/letter/editorial) | | shales have been investigated northeast of the district of Tavsanli in Northwest Turkey. Sodic amphiboles...the following minerals: chlorite, stilpnomelane, talc, almandine, deerite. Introduction In Northwest...metamorphic zones: lawsonite, lawsonite-crossite, and epidote-crossite with an increase in grade northwards...protrudes from under the Neogene northeast of the district of Tav~anh (Fig. 1, inset). During the course...a w s o n i t e (I), h e m a t i t e (black), crossite (s) a n d p h e n g i t e (p) all set in q u a |  | | Journal (article/letter/editorial) | | Volume61, pages 1005-/,00,8, A quartz-aragonite-talc schistfrom thelowerSkagit Valley, Washington BenwnRoW...Lltashington 98I 95 Abstract quartz * aragonite* talc crystalA thin metaperidotitelayer containingthe...inferred from this occurrencethat the stabilityfield of talc * CaCOr * quartzextends phaseboundary. acrossthe...on the Introduction On the basisof field evidence,talc was added by SouthSkagitHignway,2 l/2miles eastof...an actinolitic Greenschist, pair (Metz * mineral talc calcite et al.,1968;Gordon (Vance, 1966;BryMisch |  | | Journal (article/letter/editorial) | | altered to talc-carbonate or quartz-magnesite-Cr muscovite assemblages. Carbonatization and talc-forming...who studied albitic zones in the Alleghany gold district, approximately 200 km north of the study area...fault blocks of ultramafic rocks, altered mainly to talc-dolomite or magnesitequartz. The Na-rich rocks consist...and v a r i a b l e Mg/(Mg+Fe2+), and the other crossite to eckermannite, with significantly lower Fe3+/(Fe3++AlVi)...riebeckite 0.8 Glaucophane (b ,, I I 0.6 + O~ Crossite O.4 Ferro9 glaucophane 0.2 0 Riebeckite I |  | | Journal (article/letter/editorial) | | spherosiderite (botryoidal siderite) from the Buklovsky mine at Vyksy, Italic designates the names given by...engineergeologist A.G. Kitaev have visited the Blyumov mine (Southern Urals), from which they have extracted...Kitaev have visited Kochkar gold mines and Semenovsky mine. They have examined monazites and in mines along...pink topazes, rock crystal. At the ProrokoIl’insky mine, they have collected and partially bought pink topazes...visited Murzinka: Buzheninov Log, Mokrusha, Yuzhakov mine, villages of Shaitanka, Kaltashi, and Komarovo. |  | | Report (issue) | | observed in the gold gravels at Cherokee, Butte County, and this locality, became the most noted one in...short articles on California diamonds. A Amador County: few small stones have been picked up near the...towns of Volcano, Oleta and Fiddleto^vn. Butte County: In 1853 it was observed that diamonds occurred...diamonds have been obtained from the placers in this district and it leads all other districts in the State...Thompson Flat, two miles north of Oroville. El Dorado County: A diamond weighing 1| carats was found at Forest |  | | Journal (article/letter/editorial) | | lawsonite-albite rocks in the Caples Terrane and of kyanite-talc and kyanite-zoisite assemblages in the highest grade...Fig. 1. Localites in the Queenstown - Kawarau district have been known from the work of Hutton (1938...and in the matrix (Fig. 2c). Cherts in the same district are of very variable mineralogy and include Mn~rich...are broadly similar to those of the Queenstown district, but the rocks are finer grained and igneous relics...collection Abbreviations : act = actinolite, cr = crossite, rb = riebeckite, ep = epidote, chl=chlorite, |
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