Aphthitalite: Difference between revisions

Aphthitalite
Aphthitalite
	Aphthitalite, collected from Ghom Salt Dome, Qom Province, Iran
General
Category	Sulfate mineral
Formula; (repeating unit)	(K,Na)3Na(SO4)2
IMA symbol	Att
Strunz classification	7.AC.35
Crystal system	Trigonal
Crystal class	Hexagonal scalenohedral (3m) ; H-M symbol: (3 2/m)
Space group	P3m1 (no. 164)
Unit cell	a = 5.67, c = 7.33 [Å]; Z = 1
Identification
Color	White, colorless; gray, blue, green due to inclusions and impurities
Crystal habit	Tabular crystals (with distorted pseudo-orthorhombic habit); as bladed aggregates and in crusts
Twinning	On {0001} or repeated on {1120}
Cleavage	Fair on {1010}, poor on {0001}
Fracture	Conchoidal to uneven
Tenacity	Brittle
Mohs scale hardness	3
Luster	Vitreous to resinous
Diaphaneity	Transparent to opaque
Specific gravity	2.66–2.71
Optical properties	Uniaxial (+) (anomalously biaxial)
Refractive index	nω = 1.487 - 1.491 nε = 1.492 - 1.499
Birefringence	δ = 0.005
Solubility	In water
References

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Latest revision as of 06:20, 27 October 2023

Aphthitalite is a potassium sulfate mineral with the chemical formula: (K,Na)₃Na(SO₄)₂.

It was first described in 1835 for an occurrence on Mount Vesuvius, Italy. The name is from the Greek άφθητος, "unalterable", and άλας, "salt", for its stability in air.^[2] It occurs as fumarolic incrustations in volcanic environments, as small crystals and masses in evaporite deposits and in guano deposits.^[3]^[4] It occurs associated with thenardite, jarosite, sylvite and hematite in fumaroles; with blödite, syngenite, mirabilite, picromerite, borax and halite in evaporites; and with syngenite, whitlockite, monetite, niter and gypsum in guano deposits.^[4]

References

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b Mindat.org
^ ^a ^b Webmineral data
^ ^a ^b ^c Handbook of Mineralogy

This article about a specific sulfate mineral is a stub. You can help Wikipedia by expanding it.

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[Mindat-2] Mindat.org

[Webmin-3] Webmineral data

[HBM-4] Handbook of Mineralogy

[1]

[2]

[3]

[4]

@@ Line 1: / Line 1: @@
 {{infobox mineral
 | name       = Aphthitalite
-| image      =
+| image      = Aphthitalite-180031.jpg
 | alt         =
+| caption     = Aphthitalite, collected from Ghom Salt Dome, [[Qom Province]], Iran
-| caption     =
 | category    = [[Sulfate mineral]]
 | formula     = (K,Na)<sub>3</sub>Na(SO<sub>4</sub>)<sub>2</sub>
+|IMAsymbol=Att<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref>
-| strunz      = 07.AC.35
-| dana        =
-| symmetry    = Trigonal  hexagonal scalenohedral ({{overline|3}} 2/m)
-| unit cell   = a = 5.67 Å, c = 7.33 Å Z = 1
 | molweight   =
+| strunz      = 7.AC.35
+| dana        =
+| system      = [[Trigonal]]
+| class       = Hexagonal scalenohedral ({{overline|3}}m) <br/>[[H-M symbol]]: ({{overline|3}} 2/m)
+| symmetry    = ''P''{{overline|3}}m1 (no. 164)
+| unit cell   = a = 5.67, c = 7.33&nbsp;[Å]; Z&nbsp;=&nbsp;1
 | color       = White, colorless; gray, blue, green due to inclusions and impurities
 | habit       = Tabular crystals (with distorted pseudo-orthorhombic habit); as bladed aggregates and in crusts
-| system      = [[Trigonal]]
 | twinning    = On {0001} or repeated on {11{{overline|2}}0}
 | cleavage    = Fair on {10{{overline|1}}0}, poor on {0001}
@@ Line 46: / Line 48: @@
 '''Aphthitalite''' is a [[potassium sulfate]] mineral with the chemical formula: (K,Na)<sub>3</sub>Na(SO<sub>4</sub>)<sub>2</sub>.
-It was first described in 1835 for an occurrence on [[Mt. Vesuvius]], [[Italy]]. The name is from the Greek άφθητος, "unalterable", and άλας, "salt", for its stability in air.<ref name=Mindat/> It occurs as [[Fumarole|fumarolic]] incrustations in volcanic environments, as small crystals and masses in [[evaporite]] deposits and in [[guano]] deposits.<ref name=Webmin/><ref name=HBM/> It occurs associated with [[thenardite]], [[jarosite]], [[sylvite]] and [[hematite]] in fumaroles; with [[blodite]], [[syngenite]], [[mirabilite]], [[picromerite]], [[borax]] and [[halite]] in evaporites; and with syngenite, [[whitlockite]], [[monetite]], [[niter]] and [[gypsum]] in guano deposits.<ref name=HBM/>
+It was first described in 1835 for an occurrence on [[Mount Vesuvius]], [[Italy]]. The name is from the Greek άφθητος, "unalterable", and άλας, "salt", for its stability in air.<ref name=Mindat/> It occurs as [[Fumarole|fumarolic]] incrustations in volcanic environments, as small crystals and masses in [[evaporite]] deposits and in [[guano]] deposits.<ref name=Webmin/><ref name=HBM/> It occurs associated with [[thenardite]], [[jarosite]], [[sylvite]] and [[hematite]] in fumaroles; with [[blödite]], [[syngenite]], [[mirabilite]], [[picromerite]], [[borax (mineral)|borax]] and [[halite]] in evaporites; and with syngenite, [[whitlockite]], [[monetite]], [[niter]] and [[gypsum]] in guano deposits.<ref name=HBM/>
 ==References==
+{{commons category|Aphthitalite}}
 {{Reflist}}
 [[Category:Sulfate minerals]]
@@ Line 56: / Line 58: @@
 [[Category:Sodium minerals]]
 [[Category:Trigonal minerals]]
+[[Category:Minerals in space group 164]]
 {{sulfate-mineral-stub}}