Aphthitalite: Difference between revisions
Content deleted Content added
m Added IMA symbol |
Spelling Tags: Mobile edit Mobile web edit Advanced mobile edit |
||
| (10 intermediate revisions by 7 users not shown) | |||
| Line 1: | Line 1: | ||
{{infobox mineral |
{{infobox mineral |
||
| name = Aphthitalite |
| name = Aphthitalite |
||
| image = Aphthitalite-180031.jpg |
| image = Aphthitalite-180031.jpg |
||
| alt = |
| alt = |
||
| Line 6: | Line 6: | ||
| category = [[Sulfate mineral]] |
| category = [[Sulfate mineral]] |
||
| formula = (K,Na)<sub>3</sub>Na(SO<sub>4</sub>)<sub>2</sub> |
| 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> |
|||
| molweight = |
| molweight = |
||
| strunz = 7.AC.35 |
| strunz = 7.AC.35 |
||
| Line 45: | Line 46: | ||
| references = <ref name=Mindat>[http://www.mindat.org/min-280.html Mindat.org]</ref><ref name=Webmin>[http://www.webmineral.com/data/Aphthitalite.shtml Webmineral data]</ref><ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/aphthitalite.pdf Handbook of Mineralogy]</ref> |
| references = <ref name=Mindat>[http://www.mindat.org/min-280.html Mindat.org]</ref><ref name=Webmin>[http://www.webmineral.com/data/Aphthitalite.shtml Webmineral data]</ref><ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/aphthitalite.pdf Handbook of Mineralogy]</ref> |
||
}} |
}} |
||
'''Aphthitalite''' |
'''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 [[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 [[ |
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== |
==References== |
||
{{commons category|Aphthitalite}} |
{{commons category|Aphthitalite}} |
||
{{Reflist}} |
{{Reflist}} |
||
[[Category:Sulfate minerals]] |
[[Category:Sulfate minerals]] |
||
| Line 59: | Line 59: | ||
[[Category:Trigonal minerals]] |
[[Category:Trigonal minerals]] |
||
[[Category:Minerals in space group 164]] |
[[Category:Minerals in space group 164]] |
||
{{sulfate-mineral-stub}} |
{{sulfate-mineral-stub}} |
||
Latest revision as of 06:20, 27 October 2023
| 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[1] |
| 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 | [2][3][4] |
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
[edit]
Wikimedia Commons has media related to Aphthitalite.
- ^ 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