Paragonite
| Paragonite | ||
|---|---|---|
Specific gravity 2.78 | | |
| Optical properties | Biaxial (−) | |
| Refractive index | nα = 1.564 – 1.580 nβ = 1.594 – 1.609 nγ = 1.600 – 1.609 | |
| Birefringence | δ = 0.036 | |
| Dispersion | r < v strong | |
| Ultraviolet fluorescence | None | |
| References | [2][3][4][5] | |
Paragonite is a
greenschist facies, paragonite and glaucophane are transformed into chlorite and albite.[6] Jadeite bearing pyroxene minerals have suggested clinozoisite and paragonite are associated and derived from lawsonite releasing quartz and water via the following reaction:[7]
It was first described in 1843 for an occurrence at Mt. Campione, Tessin, Switzerland.[4] The name derives from the Greek, paragon, for misleading, due to its similar appearance to talc.[5]
References
- S2CID 235729616.
- ^ Mineralienatlas
- ^ Mindat
- ^ a b Webmineral
- ^ a b Handbook of Mineralogy
- ISBN 978-1-86239-142-0.
- ^ Deer, William A. (1997). Single-chain Silicates, Volume 2A. Geological Society of London. p. 477.
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