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|Lustre:||Vitreous||Hardness:||4 - 5|
|Name:||From the Greek for "away from" (ἀπό, apo) and "leaf" (φύλλον, phyllos), in allusion to the way it exfoliates upon heating. The "-(NaF)" suffix documents the dominant and distinctive components in this member of the Apophyllite family (sodium and fluoride).|
The mineral name changed from apophyllite-(NaF) to fluorapophyllite-(Na) (Hatert et al. 2013)
This page provides mineralogical data about Fluorapophyllite-(Na).
Classification of Fluorapophyllite-(Na)
|IMA status:||Approved 1976|
|Strunz 8th edition ID:||8/H.01-10|
|Nickel-Strunz 10th (pending) edition ID:||9.EA.15|
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
|Dana 8th edition ID:||188.8.131.52|
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
3 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
|Hey's CIM Ref.:||17.1.4|
17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
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Type Occurrence of Fluorapophyllite-(Na)
|Type Locality:||Sampo mine, Bitchu-cho-shitouyouze (Bicchu-cho-shitouyouze), Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan|
|Year of Discovery:||1976|
Physical Properties of Fluorapophyllite-(Na)
|Colour:||Brownish-yellow, yellowish-brown, colourless|
|Hardness (Mohs):||4 - 5|
Crystallography of Fluorapophyllite-(Na)
|Cell Parameters:||a = 8.87Å, b = 8.88Å, c = 15.79Å|
|Ratio:||a:b:c = 0.999 : 1 : 1.778|
|Unit Cell Volume:||V 1,243.71 Å³ (Calculated from Unit Cell)|
Optical Data of Fluorapophyllite-(Na)
|RI values:||nα = 1.536 nβ = 1.538 nγ = 1.544|
|2V:||Measured: 32° , Calculated: 62°|
|Maximum Birefringence:||δ = 0.008|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v strong|
Chemical Properties of Fluorapophyllite-(Na)
|Simplified for copy/paste:||NaCa4(Si8O20)F·8H2O|
|Essential elements:||Ca, F, H, Na, O, Si|
|All elements listed in formula:||Ca, F, H, Na, O, Si|
Relationship of Fluorapophyllite-(Na) to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Fluorapophyllite-(Na)
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Fluorapophyllite-(Na)
American Mineralogist (1981): 66: 416-423.
HATERT, F., MILLS, S.J., PASERO, M. and WILLIAMS, P.A. (2013) CNMNC guidelines for the use of suffixes and prefixes in mineral nomenclature, and for the preservation of historical names. European Journal of Mineralogy 25, 113-115.
Internet Links for Fluorapophyllite-(Na)
Localities for Fluorapophyllite-(Na)
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Hangha, Kenema District, Eastern Province, Sierra LeoneFrom Dana Slaughter, 24th Jul 2014 03:40:45