Properties of synthetic triclinic KFeSi3O8, iron-microcline, with some observations on the iron-microcline⇌iron-sanidine transition
Journal of Petrology
By: David R. Wones and Daniel E. Appleman
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Abstract
Triclinic KFeSi 3 O 8 , iron-microcline, has been synthesized from oxide mixes and by complete conversion of monoclinic KFeSi 3 O 8 , iron-sanidine. Iron-microcline is triclinic, C ī, a =8·68±0·01 Å, b =13·10±0·01, c =7·34±0·01, α =90° 45′±10′, β =116° 03′±10′, γ=86°14′±10′. The optical properties (Na light) are: α =1·585±0·002, β =1·596±0·002, γ=1·605±0·002, 2 V α =85° (calc.), X≈ b , Z ∧ c =20°±5°. A reversible phase transition between triclinic and monoclinic KFeSi 3 O 8 occurs at 704°±6° C at 2000 bars total pressure. Iron-microcline is the low-temperature polymorph; no intermediate polymorphs were observed in either hydrothermal or dry heating experiments.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Properties of synthetic triclinic KFeSi3O8, iron-microcline, with some observations on the iron-microcline⇌iron-sanidine transition |
| Series title | Journal of Petrology |
| DOI | 10.1093/petrology/4.1.131 |
| Volume | 4 |
| Issue | 1 |
| Year Published | 1963 |
| Language | English |
| Publisher | Oxford University Press |
| Description | 7 p. |
| First page | 131 |
| Last page | 137 |