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Search for specimens: View all albite specimens from Shigar District, Pakistan
Shigar District lies north of Skardu in Gilgit-Baltistan, where the Shigar River system is fed by the Braldu and Basha drainage networks coming out of the Karakoram. Mineral labels can be confusing: older specimens often say âSkardu District,â âNorthern Areas,â âShigar Valley,â or simply âSkardu,â while current locality usage places many of the classic sites in Shigar District. Braldu and Basha localities are also commonly grouped commercially under âShigar Valley,â even when the mine is in a tributary valley.
The principal albite-bearing specimen environments are granitic pegmatites and Alpine-type clefts. The pegmatites intrude high-grade metamorphic and gneissic country rocks, including the Dassu orthogneiss and related Karakoram metamorphic units. Geological studies distinguish simple, generally less gem-productive pegmatites from evolved or complex zoned pegmatites. The evolved bodies include muscovite-tourmaline-beryl-garnet and muscovite-tourmaline types, and these are the feldspar-rich systems that produce many of the aquamarine, schorl, topaz, fluorite, apatite, garnet, and albite matrix specimens known to collectors.
In the evolved pegmatites, albite is not an incidental accessory. It is one of the dominant framework minerals, commonly accompanied by muscovite and quartz. The gem pockets are typically described in the central and core-margin zones, where crystals may be enclosed in clay or pocket material. The simple pegmatites, by contrast, are more biotite- and orthoclase-rich and are less important for fine gem-specimen production.
The district also includes important Alpine-type cleft localities, especially around Alchuri and Hashupa. These are not simply another style of pegmatite pocket. Around Alchuri, collectors encounter pericline-twinned albite, adularia, quartz, calcite, epidote, clinozoisite, diopside, prehnite, titanite, rutile, siderite, vesuvianite, byssolite, and related cleft minerals. These specimens often appeal to a different collector than the aquamarine-on-cleavelandite pieces: sharper crystallography, small-scale perfection, and Alpine associations rather than large gem beryl drama.
Mining is mostly artisanal and pocket-driven. There is no single industrial âalbite mineâ in the way a collector might imagine a classic European feldspar quarry. Instead, miners work pegmatite veins, pockets, and steep mountainside occurrences around named villages and mine areas such as Dassu, Yuno, Kashmal, Mungo, Nyet Bruk, Baha, Doko, Bisil, Alchuri, and related localities. Output is episodic. A productive pocket may appear, feed the local market for a short time, and then vanish into memory; another slope or vein may become active the following season.æŽå²çã«ã¯ãDassuå°åã¯åæã®ã¢ã¯ã¢ããªã³ã®å ±åãšããªã«ããã³é·ç³ã®ãããªãã¯ã¹æšæ¬ãšã®é·ãé¢é£æ§ã®ãããåºå¹¹çãªåç§°ã®äžã€ãšããŠäœçœ®ã¥ããããŠããŸãã
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Muhammad Hassan Agheem, Mohammad Tahir Shah, Tahseenullah Khan, Laghari, Dars ãããŠåå, âX-Ray Diffraction Studies of Gemstones from Shigar Valley, Skardu, Gilgit-Baltistan Region, Northern Areas of Pakistan,â Sindh University Research Journal (Science Series), 43(1), 37â42, 2011 â XRD ã«ããã·ã¬ã«ç£å®ç³ã®åå®ãšãããªãªãŠã é±ããã«ããªã³ãèç³ãçç°ç³ããããŒãºãå ±çããè§éç³çŸ€é±ç©ãããã³å®ç³å«æãã°ãã¿ã€ãäžã®ã¢ã«ããããäžè¬çãªé¢é£é±ç©ãšããŠèšèŒãããŠããã
Muhammad Hassan Agheem, Mohammad Tahir Shah, Tahseenullah Khan, Mamoru Murata, Humaira Dars, ãã㊠Muhammad Zafar, âPetrogenetic evolution of pegmatites of the Shigar Valley, Skardu, Gilgit-Baltistan, Pakistan,â Arabian Journal of Geosciences, 8, 9877â9886, 2015 â é²åããã¢ã«ãããâé»é²æ¯å¯é±ç©ããåçŽãªæ£é·ç³âç·ç°Ÿç³å«æãã°ãã¿ã€ããšåºå¥ããéµãšãªãããããžã§ããã£ãã¯è«æã
Dudley Blauwet, âWorld-Class Localities: The Shigar, Braldu and Basha Valleys,â in Pakistan: Minerals, Mountains & Majesty, extraLapis English No. 6, Lapis International, 2004, pp. 36â47 â å°åã®å€å žçãªæšæ¬çç£è°·ã«å¯Ÿããåºç€çãªåéå®¶åãçŸå°è§£èª¬ã
Bill Smith, Carol Smith and Dudley Blauwet, âA Guide to the Mineral Localities of the Northern Areas, Pakistan,â The Mineralogical Record, 28(3), 183â200, 1997 â åéšããã¹ã¿ã³ã®é »ç¹ã«åŒçšãããçŸå°ã¬ã€ããåŸã®çŸå°èšé²ã§çšãããããã·ã£è°·ã®åç §ãå«ãã
Dudley Blauwet, âFamous mineral localities: Alchuri, Shigar Valley, Northern Areas, Pakistan,â The Mineralogical Record, 37(6), 513â540, 2006 â ã¢ã«ãã¥ãªãšãã®ã¢ã«ãã¹åè£ãç®é±ç©çŸ€ã®äž»èŠãªå ¬åŒåéèšé²ãã¢ã«ããã嫿ããŒã¹ãå«ãã
Wendell E. Wilson, âMinerals from Alchuri,â The Mineralogical Record, 37(6), 534â536, 2006 â åãã¢ã«ãã¥ãªå·ã®å¯Ÿããªãé±ç©ããŒãã
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