Fluorapophyllite-(NH₄)
A valid IMA mineral species
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About Fluorapophyllite-(NH₄)
Formula:
NH4Ca4(Si8O20)F · 8H2O
Colour:
Colourless to light pink
Lustre:
Vitreous, Pearly
Hardness:
4½ - 5
Specific Gravity:
2.325 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
Named for being the ammonium (NH4) analogue of fluorapophyllite-(K).
Ammonium dominant fluorapophyllite. The NH4 analogue of fluorapophyllite-(K).
Unique combination of elements.
First group member with essential ammonium.
Unique combination of elements.
First group member with essential ammonium.
Unique Identifiers
Mindat ID:
53993
Long-form identifier:
mindat:1:1:53993:3
GUID
(UUID V4):
(UUID V4):
f8d5ef6a-31ec-4755-a7e6-7939d1e808e2
IMA Classification of Fluorapophyllite-(NH₄)
Approved, Pending publication
IMA Formula:
(NH4)Ca4(Si8O20)F · 8H2O
Approval year:
2019
First published:
2020
Classification of Fluorapophyllite-(NH₄)
9.EA.
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Fapo-NH4 | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Fapo | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Fluorapophyllite-(NH₄)
Vitreous, Pearly
Transparency:
Transparent
Colour:
Colourless to light pink
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {001}
On {001}
Fracture:
Irregular/Uneven
Density:
2.325 g/cm3 (Calculated)
Optical Data of Fluorapophyllite-(NH₄)
Type:
Uniaxial (+)
RI values:
nω = 1.541(5) nε = 1.539(8)
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Chemistry of Fluorapophyllite-(NH₄)
Mindat Formula:
NH4Ca4(Si8O20)F · 8H2O
Crystallography of Fluorapophyllite-(NH₄)
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mnc
Cell Parameters:
a = 8.99336(9) Å, c = 15.7910(3) Å
Ratio:
a:c = 1 : 1.756
Unit Cell V:
1277.18 ų
Z:
2
Morphology:
Forms {110}, {101} and {001}
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.897 Å | (31) |
| 7.812 Å | (13) |
| 4.547 Å | (14) |
| 3.946 Å | (100) |
| 2.985 Å | (39) |
| 2.484 Å | (11) |
| 2.010 Å | (10) |
| 1.579 Å | (12) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4a: Earth’s earliest continental crust | >4.4-3.0 |
| 20 : Acidic volcanic rocks |
Type Occurrence of Fluorapophyllite-(NH₄)
General Appearance of Type Material:
Clusters, aggregates or crystalline crusts consisting of individual, well-developed crystals up to 4 mm in size
Place of Conservation of Type Material:
In the collections of the Department of Mineralogy and Petrology, National Museum in Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, catalogue number P1P 44/2019
Geological Setting of Type Material:
In cavities of quartz–illite–saponite–tobelite xenolith embedded in pyroxene andesite
Associated Minerals at Type Locality:
Reference:
Števko, M., Sejkora, J., Plášil, J., Dolníček, Z., Škoda, R. (2020) Fluorapophyllite-(NH4), NH4Ca4(Si8O20)F⋅8H2O, a new member of the apophyllite group from the Vechec quarry, eastern Slovakia. Mineralogical Magazine: 84(4): 533–539.
Synonyms of Fluorapophyllite-(NH₄)
Other Language Names for Fluorapophyllite-(NH₄)
German:Fluorapophyllit-(NH4)
Relationship of Fluorapophyllite-(NH₄) to other Species
Member of:
Other Members of this group:
| Fluorapophyllite-(Cs) | CsCa4(Si8O20)F · 8H2O | Tet. |
| Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mnc |
| Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O | Orth. |
| Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O | Tet. 4/mmm (4/m 2/m 2/m) |
| Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O | Tet. |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.EA. | Bussyite-(Y) | (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 |
| 9.EA. | Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.07 | Fluorapophyllite-(Cs) | CsCa4(Si8O20)F · 8H2O |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O |
| 9.EA.20 | Magadiite | Na2Si14O29 · 11H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(Ce) | Na2CeSi6O14 · 6H2O |
| 9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O |
| 9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.45 | Perettiite-(Y) | Y2Mn4FeSi2B8O24 |
| 9.EA.45 | Badakhshanite-(Y) | Y2Mn4Al(Si2B7BeO24) |
| 9.EA.47 | Shlykovite | KCa[Si4O9(OH)] · 3H2O |
| 9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.50 | Diegogattaite | Na2CaCu2Si8O20 · H2O |
| 9.EA.52 | Yangite | PbMnSi3O8 · H2O |
| 9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.60 | Tumchaite | Na2Zr(Si4O11) · 2H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O |
| 9.EA.75 | Zeravshanite | Na2Cs4Zr3[Si18O45]*2H2O |
| 9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
Fluorescence of Fluorapophyllite-(NH₄)
Not fluorescent
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Fluorapophyllite-(NH₄)
mindat.org URL:
https://www.mindat.org/min-53993.html
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References for Fluorapophyllite-(NH₄)
Reference List:
Localities for Fluorapophyllite-(NH₄)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Slovakia (TL) | |
|
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Vechec quarry, Vechec, Vranov nad Topľou District, Prešov Region, Slovakia