| Reference Type | Journal (article/letter/editorial) |
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| Title | Order-disorder in sapphirine |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | McKie, Duncan | Author |
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| Year | 1963 (December) | Volume | 33 |
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| Issue | 263 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-263-635.pdf+ |
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| DOI | doi:10.1180/minmag.1963.033.263.02Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 5765 | Long-form Identifier | mindat:1:5:5765:7 |
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| GUID | 0 |
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| Full Reference | McKie, Duncan (1963) Order-disorder in sapphirine. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (263) 635-645 doi:10.1180/minmag.1963.033.263.02 |
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| Plain Text | McKie, Duncan (1963) Order-disorder in sapphirine. Mineralogical Magazine and Journal of the Mineralogical Society, 33 (263) 635-645 doi:10.1180/minmag.1963.033.263.02 |
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| In | (1962) Mineralogical Magazine Vol. 33 (263) Mineralogical Society |
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| Abstract/Notes | SummaryYellow sapphirine with a doubled b-axis occurs in enstatite-hornblende-sapphirine rocks at the contact between dolomite marble and yoderite-quartz-talc schist on Mautia Hill, Tanganyika. It has refractive indices α 1·725± 0·002, γ 1·732±0·002, 2Vγ66°, pleochroism a pale yellow, β pale lime green, γ pale pinkish orange, and a composition corresponding to Mg3·67Mn0·04Fe2+0·17Ti0·01Fe3+0·33Als·07Si1·75O20·00. Its unit-cell dimensions are approximately a 9·85 Å, b 28·6Å, c 9·96 Å, β 110° 30′, and its diffraction pattern exhibits diffuse streaks parallel to b*, on which lie diffuse intensity maxima representing the relics of certain types of sharp reflexions of normal sapphirine ; this is interpreted as indicative of partial MgAl ordering. The associated enstatite and hornblende have compositions Mg7·58Mn0·02Fe2+0·02Ti0·01Fe3+0·13Al[6]0·25Al0·41[4]Si7·59O24·00 and K0·04Na0·16Ca1·95Mg4·37Mn0·01Fe0·052+Ti0·04Fe0·253+Al0·42[6]Al0·91[4]Si7·09O22·24(OH)1·76respectively and are accompanied by accessory hematite and pseudobrookite. Preliminary heating experiments have demonstrated the transformation of single crystals of partially ordered Mautia sapphirine to single crystals of a defect spinel phase after 48 hours at 1287° C in air; normal disordered Panrimali sapphirine remains unchanged by similar heat treatment. |
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