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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).|
This page provides mineralogical data about Apophyllite-(NaF).
Classification of Apophyllite-(NaF)
|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:||22.214.171.124|
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 Apophyllite-(NaF)
|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 Apophyllite-(NaF)
|Colour:||Brownish-yellow, yellowish-brown, colourless|
|Hardness (Mohs):||4 - 5|
Crystallography of Apophyllite-(NaF)
|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 Apophyllite-(NaF)
|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 Apophyllite-(NaF)
|Essential elements:||Ca, F, H, Na, O, Si|
|All elements listed in formula:||Ca, F, H, Na, O, Si|
Relationship of Apophyllite-(NaF) to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Apophyllite-(NaF)
|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 Apophyllite-(NaF)
American Mineralogist (1981): 66: 416-423.
Internet Links for Apophyllite-(NaF)
Localities for Apophyllite-(NaF)
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: Mt Wyatt area, Whitsunday Region, Queensland, AustraliaFrom Steve Sorrell, 19th May 2013 05:43:10