| Reference Type | Journal (article/letter/editorial) |
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| Title | Harmotome from the Tokatoka district, New Zealand |
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| Journal | Mineralogical Magazine |
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| Authors | Black, Philippa M. | Author |
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| Year | 1969 (December) | Volume | 37 |
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| Issue | 288 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_37/37-288-453.pdf+ |
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| DOI | doi:10.1180/minmag.1969.037.288.04Search 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 | 6317 | Long-form Identifier | mindat:1:5:6317:7 |
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| GUID | 0 |
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| Full Reference | Black, Philippa M. (1969) Harmotome from the Tokatoka district, New Zealand. Mineralogical Magazine, 37 (288) 453-458 doi:10.1180/minmag.1969.037.288.04 |
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| Plain Text | Black, Philippa M. (1969) Harmotome from the Tokatoka district, New Zealand. Mineralogical Magazine, 37 (288) 453-458 doi:10.1180/minmag.1969.037.288.04 |
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| In | (1969, December) Mineralogical Magazine Vol. 37 (288) Mineralogical Society |
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| Abstract/Notes | Harmotome, associated with analcime, is described from andesite dykes at Rehia and Maungarahu in the Tokatoka district, New Zealand. The Maungarahu harmotome has the composition: (Na1·03K0·23)(Ba1·54Ca0·18)Al4·66Si11·31 12·39 H2O; physical properties: α 1·498, β 1·503, γ 1·506, 2Vγ 75–82° β:[001] 28° D 2·378; and cell constants: a 9· 906±0·006, b 14·119 ±0·003, c 8·712±0·007 Å, β 124° 57′ ± 3′. The harmotome is Ba-poor, and 2 Na+ has substituted for Ba2+ on a valency basis. Analcime associated with the Maungarahu harmotome has chemical composition: (Na15·16 K0·03Ca0·09)Al15·52Si32·47 15·93 H2O and physical properties: n = 1·483, D = 2·257, a = 13·708 Å. The zeolites are believed to have crystallized from Na and Ba-rich alkaline solutions at approximately 200°C The source of the Ba is baryte concretions in adjacent limestones. |
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