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Search for specimens: View all aquamarine specimens from Shigar District, Pakistan
Shigar District lies in Gilgit-Baltistan in northern Pakistan, in the high Karakoram country north and northeast of Skardu. In collector usage, âShigarâ may refer narrowly to Shigar Valley, more broadly to the ShigarâSkardu specimen district, or to occurrences in the administrative Shigar District, including Braldu Valley localities. This label history is important: older specimens may read âSkardu District,â âShigar River Valley,â âNorthern Areas,â âBaltistan,â or simply âPakistan,â even when they came from what is now recognized as Shigar District. Serious collectors should preserve older labels but, where possible, add modern locality clarification rather than replacing the original wording.
The aquamarine deposits are gem-bearing granitic pegmatites, many of them zoned and locally miarolitic. In simple terms, the best aquamarines grew in open cavities or vugs within coarse pegmatite zones, where late magmatic-hydrothermal fluids allowed well-formed crystals to develop into open space. Field and analytical work on the Shigar Valley pegmatites describes both simple and complex or zoned bodies, with gem-quality beryl concentrated near core-margin and cavity-bearing zones. The same pegmatitic system produces or hosts topaz, fluorite, tourmaline, garnet, apatite, quartz, muscovite, feldspar and other minerals, though not every species belongs to the same genetic episode or pocket environment.
The host rocks belong to the complex metamorphic and igneous framework of the Karakoram. Publications on the district describe pegmatite bodies intruding metasedimentary and meta-igneous rocks of the Karakoram Metamorphic Complex; more recent petrogenetic work emphasizes peraluminous, S-type granitic pegmatites derived from partial melting of metapelitic rocks during post-collisional tectonism, rather than a simple direct link to nearby plutonic units. For the collector, the practical result is visible in the specimens: feldspar-rich pegmatite pockets, contrasting white albite or microcline matrix, black tourmaline, and the highly prized blue beryl crystals that grew in late-stage open cavities.
Mining is small-scale, seasonal and topographically demanding. Many workings are reached by steep tracks, rope-assisted cliff traverses, or tunnels driven into pegmatite veins exposed high above the valley floors. At lower elevations some work can continue for much of the year, but the higher and more productive workings are constrained by weather, snow, access, and the short mountain season. Production therefore comes in pulses: a pocket opens, specimens appear in local hands, a dealer or broker secures the best pieces, and the material filters onto the international market under labels that may mention Shigar Valley, Dassu, Goand, Nyet Bruk, Goyungo, Braldu Valley, or Skardu.çŸä»£ã®ã³ã¬ã¯ã·ã§ã³ã¢ã¯ã»ã¹ã¯ã西æŽçãªæå³ã§ã® casual ãªé倿¡éã§ã¯ãªãããããã¯å°å æææš©ãè³è²žå¥çŽãå®¶æã®æš©å©äž»åŒµãå±éºãªå°åœ¢ãäŒŽãæŽ»çºãªæ¡æå°åã§ããã蚪åè ã¯ãã°ãã¿ã€ãã® workings ã«æ©ããŠå ¥ããæ¡åã§ãããšã¯æåŸ ãã¹ãã§ã¯ãªããæšæ¬ã¯éåžžãããã¹ã¿ã³ã®é±å€«ãå°å ã®ãã£ãŒã©ãŒãã¹ã«ãã«ãŸãã¯ãã·ã£ã¯ãŒã«ã®äº€ææ¥è ããããŠåœéçãªé±ç©ãã£ãŒã©ãŒãéããŠååŸããããæãå®å šã§å«ççãªã³ã¬ã¯ã·ã§ã³ã®éã¯ãé£ç¶ããæµéçµè·¯ã説æãã修埩㻠restorationã»å®å®åããã³å Žæã®äžç¢ºå®æ§ãé瀺ãã reputable ãªè²©å£²è ãéããŠè¡ãããšã§ããã
泚ç®ãã¹ãçºèŠã¯å°åºã®è©å€ã圢ã¥ãã£ãŠãããã·ã¬ãŒã«æžè°·ã¯é·ãéãç·©ãå®ç³çµæ¶ããããªã¯ã¹æšæ¬ãçç£ããŠãããã Dassu ã®2018幎㮠Aqua-Garnet ãã±ãããšã Braldu æžè°·å°åã®2019幎ã®ããã³ã°ã»ãªãã»ã«ã·ããŒã«ããã±ããããå°åºã®è©äŸ¡ãèããé«ãããAqua-Garnet ãã±ããã¯èµ€è²ã¬ãŒããããã¯ã©ãŒããã¢ã«ãã€ãã feldsparãåè§£ç³ãšã®åªããã¢ãœã·ãšãŒã·ã§ã³ãçã¿åºãããããã³ã°ã»ãªãã»ã«ã·ããŒã«ãçºèŠã¯ãå±±ã®å¥¥æ·±ãã®ãã±ããããã®å·šå€§ãªã¢ã¯ã¢ããªã³ãã¯ã©ãŒããã¢ã«ãã€ãã埮æ¶é·å²©ã®çŸ€ãçã¿åºãããã®æ¡æã¯ããã¹ã¿ã³ã«ãããæšæ¬å¿åã®é±æ¥ã®ç¯ç®ãšãªãåºæ¥äºãšãªã£ãã## Shigar District, Pakistan ã®ã¢ã¯ã¢ããªã³ã®ç¹æ§
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M. H. Agheem, M. T. Shah, T. Khan, M. Murata, M. Arif and H. Dars, âShigar valley gemstones, their chemical composition and origin, Skardu, Gilgit-Baltistan, Pakistan,â Arabian Journal of Geosciences, 2014, 7, 3801â3814 â ã·ã¬ã«è°·ã®å®ç³ã®ååŠçµæãšèµ·æºã«é¢ããéèŠè«æã垯ç¶è±åŽå²©ãã°ãã¿ã€ããšå€æå²©äžã®å®ç³ã®èµ·æºã解説ã
M. H. Agheem, M. T. Shah, T. Khan, M. Arif and A. Laghari, âMineralogical studies of the gemstones-bearing pegmatites of the Shigar valley, Skardu, Gilgit-Baltistan, Pakistan,â Journal of Himalayan Earth Sciences, 2010 â å®ç³ãå«ãã·ã¬ã«ãã°ãã¿ã€ããšãããã®é±ç©çµæã«é¢ããèŠçŽã
M. H. Agheem, M. T. Shah, T. Khan and H. Dars, âPetrogenetic evolution of pegmatites of the Shigar Valley, Skardu, Gilgit-Baltistan, Pakistanâ â ã«ã©ã³ã«ã 倿è€åäœã®åèè§£ã«é¢é£ããSåéå°ã¢ã«ãããŠã ãã°ãã¿ã€ãã®å²©ç³åœ¢æå²èŠçŽã
Manzoor Ahmad Badar, Safdar Hussain, Shanawer Niaz and Saif Ur Rehman, âX-ray Diffraction Study of Aquamarine from Shigar Deposits, Skardu Valley, Northwest Pakistan,â International Journal of Economic and Environmental Geology, 2017, 8(4), 33â40 â ã·ã¬ã«é±åºã®æ·¡ç·ïœç·ããã£ãéã®ã¢ã¯ã¢ããªã³ã®XRDç ç©¶ã
Daniel Trinchillo, âCollecting the King of Kashmir Aquamarine,â The Mineralogical Record, Vol. 51, NovemberâDecember 2020 â 2019幎ã®ãã«ã·ããŒã«ã®çãã¢ã¯ã¢ããªã³ãã±ããã®çŸå Žã»æ¡æã»æºåã®è©³çŽ°å ±åã
Mindat occurrence: Aquamarine from Shigar Valley, Shigar District, Gilgit-Baltistan, Pakistan](https://www.mindat.org/locentry-40671.html) â é¢é£çš®ãåççµ±èšãããã³ç£å°çžäºåç §ãåããé±ç©ç£ç¶ããŒãžã
Mindat occurrence: Aquamarine from Nyet Bruk, Nyet, Braldu Valley, Shigar District, Gilgit-Baltistan, Pakistan](https://www.mindat.org/locentry-481921.html) â é«çŽã·ã¬ã«å°åºã¢ã¯ã¢ããªã³æšæ¬ã«é¢é£ãããã©ã«ãã¥æžè°·ã®ç¹å®ç£å°ã
Mindat occurrence: Aquamarine from Goyungo, Braldu Valley, Shigar District, Gilgit-Baltistan, Pakistan](https://www.mindat.org/locentry-1352911.html) â ãã©ã«ãã¥æžè°·ã®é±åºã«é¢é£ããç£ç¶ããŒãžãçç£æç¹ã
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