Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Alunogen

This page is currently not sponsored. Click here to sponsor this page.
Formula:
Al2(SO4)3 · 17H2O
Colour:
Colorless in crystals, aggregates white, or pale yellow or red from impurities.
Lustre:
Vitreous, Silky
Hardness:
1½ - 2
Crystal System:
Triclinic
Name:
From the Latin "alum" and the Greek γεννώ ("genno"), "to create".
A hydrated aluminium sulfate. The highest hydrate of natural Al sulphate, when compared to 'meta-alunogen', Unnamed (Al Sulphate-Hydrate), and UM1976-22-SO:AlFeH. Also the hydrated counterpart of millosevichite.

At high temperates, alunogen may dehydrate to its pentahydrate, Unnamed (Al Sulphate-Hydrate).

Compare also 'UM1987-13-SO:AlH' and 'UM1976-22-SO:AlFeH'.


Classification of Alunogen

Approved, 'Grandfathered' (first described prior to 1959)
7.CB.45

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
Dana 7th ed.:
29.8.6.1
29.8.6.1

29 : HYDRATED ACID AND NORMAL SULFATES
8 : A2(XO4)3·H2O
25.6.7

25 : Sulphates
6 : Sulphates of Al and Tl

Physical Properties of Alunogen

Vitreous, Silky
Transparency:
Transparent
Colour:
Colorless in crystals, aggregates white, or pale yellow or red from impurities.
Comment:
colorless in transmitted light.
Streak:
White
Hardness:
1½ - 2 on Mohs scale

Optical Data of Alunogen

Type:
Biaxial (+)
RI values:
nα = 1.473 nβ = 1.474 nγ = 1.480
2V:
Measured: 31° to 69°, Calculated: 46°
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Alunogen

Formula:
Al2(SO4)3 · 17H2O
IMA Formula:
Al2(SO4)3(H2O)12 · 5H2O

Crystallography of Alunogen

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Morphology:
Crystals rare, small; prismatic [001] or {010} with a hexagonal outline about [010]; very complex, with about 60 forms noted. Commonly as delicate fibrous masses or crusts; effloresences; massive, fibrous to 5mm.

Twinning:
On {010}.

X-Ray Powder Diffraction

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Synonyms of Alunogen

Other Language Names for Alunogen

Varieties of Alunogen

Phosphoralunogen

A variety of Alunogen containing some P2O5

Common Associates

EpsomiteMgSO4 · 7H2O
EpsomiteMgSO4 · 7H2O
GypsumCaSO4 · 2H2O
HalotrichiteFeAl2(SO4)4 · 22H2O
MarcasiteFeS2
MelanteriteFeSO4 · 7H2O
PickeringiteMgAl2(SO4)4 · 22H2O
PyriteFeS2
Associated Minerals Based on Photo Data:
Coquimbite23 photos of Alunogen associated with Coquimbite on mindat.org.
Copiapite14 photos of Alunogen associated with Copiapite on mindat.org.
Chalcanthite12 photos of Alunogen associated with Chalcanthite on mindat.org.
Metavoltine7 photos of Alunogen associated with Metavoltine on mindat.org.
Voltaite7 photos of Alunogen associated with Voltaite on mindat.org.
Halotrichite7 photos of Alunogen associated with Halotrichite on mindat.org.
Jarosite4 photos of Alunogen associated with Jarosite on mindat.org.
Römerite4 photos of Alunogen associated with Römerite on mindat.org.
Meta-alunogen3 photos of Alunogen associated with Meta-alunogen on mindat.org.
Cuprian Melanterite3 photos of Alunogen associated with Cuprian Melanterite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

7.CB.05Dwornikite(Ni,Fe)SO4 · H2O
7.CB.05GunningiteZnSO4 · H2O
7.CB.05KieseriteMgSO4 · H2O
7.CB.05Poitevinite(Cu,Fe,Zn)SO4 · H2O
7.CB.05SzmikiteMnSO4 · H2O
7.CB.05SzomolnokiteFeSO4 · H2O
7.CB.05CobaltkieseriteCoSO4 · H2O
7.CB.07SanderiteMgSO4 · 2H2O
7.CB.10BonattiteCuSO4 · 3H2O
7.CB.15Aplowite(Co,Mn,Ni)SO4 · 4H2O
7.CB.15Boyleite(Zn,Mg)SO4 · 4H2O
7.CB.15Ilesite(Mn,Zn,Fe)SO4 · 4H2O
7.CB.15RozeniteFeSO4 · 4H2O
7.CB.15StarkeyiteMgSO4 · 4H2O
7.CB.15DrobeciteCdSO4 · 4H2O
7.CB.15CranswickiteMgSO4 · 4H2O
7.CB.20ChalcanthiteCuSO4 · 5H2O
7.CB.20JôkokuiteMnSO4 · 5H2O
7.CB.20PentahydriteMgSO4 · 5H2O
7.CB.20SiderotilFeSO4 · 5H2O
7.CB.25Bianchite(Zn,Fe)SO4 · 6H2O
7.CB.25Chvaleticeite(Mn,Mg)SO4 · 6H2O
7.CB.25FerrohexahydriteFeSO4 · 6H2O
7.CB.25HexahydriteMgSO4 · 6H2O
7.CB.25Moorhouseite(Co,Ni,Mn)SO4 · 6H2O
7.CB.25Nickelhexahydrite(Ni,Mg,Fe)SO4 · 6H2O
7.CB.30RetgersiteNiSO4 · 6H2O
7.CB.35BieberiteCoSO4 · 7H2O
7.CB.35BoothiteCuSO4 · 7H2O
7.CB.35MallarditeMnSO4 · 7H2O
7.CB.35MelanteriteFeSO4 · 7H2O
7.CB.35Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2O
7.CB.35Alpersite(Mg,Cu)[SO4] · 7H2O
7.CB.40EpsomiteMgSO4 · 7H2O
7.CB.40GoslariteZnSO4 · 7H2O
7.CB.40MorenositeNiSO4 · 7H2O
7.CB.45Meta-alunogenAl2(SO4)3 · 12H2O
7.CB.50AluminocoquimbiteFeAl(SO4)3 · 9H2O
7.CB.55CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
7.CB.55ParacoquimbiteFe2(SO4)3 · 9H2O
7.CB.55Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2O
7.CB.60KorneliteFe2(SO4)3 · 7H2O
7.CB.65QuenstedtiteFe2(SO4)3 · 11H2O
7.CB.70LauseniteFe2(SO4)3·5H2O
7.CB.75LishizheniteZnFe2(SO4)4 · 14H2O
7.CB.75RömeriteFe2+Fe3+2(SO4)4 · 14H2O
7.CB.80RansomiteCuFe2(SO4)4 · 6H2O
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2O
7.CB.85BíliniteFe2+Fe3+2(SO4)4 · 22H2O
7.CB.85Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O
7.CB.85HalotrichiteFeAl2(SO4)4 · 22H2O
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2O
7.CB.85Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2O
7.CB.85Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
7.CB.90MeridianiiteMgSO4 · 11H2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

25.6.1RostiteAl(SO4)(OH) · 5H2O
25.6.2JurbaniteAl(SO4)(OH) · 5H2O
25.6.3KhademiteAl(SO4)F · 5H2O
25.6.4Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
25.6.5AluminiteAl2(SO4)(OH)4 · 7H2O
25.6.6Meta-alunogenAl2(SO4)3 · 12H2O
25.6.8FelsőbányaiteAl4(SO4)(OH)10 · 4H2O
25.6.9BasaluminiteAl4(SO4)(OH)10 · 4H2O
25.6.10HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
25.6.11ZaheriteAl12(SO4)5(OH)26 · 20H2O
25.6.12TamarugiteNaAl(SO4)2 · 6H2O
25.6.13MendoziteNaAl(SO4)2 · 11H2O
25.6.14Alum-(Na)NaAl(SO4)2 · 12H2O
25.6.15NatroaluniteNaAl3(SO4)2(OH)6
25.6.16KaliniteKAl(SO4)2 · 11H2O Not confirmed
25.6.17Alum-(K)KAl(SO4)2 · 12H2O
25.6.18AluniteKAl3(SO4)2(OH)6
25.6.19Natroalunite-2c(Na,Ca0.5,K)Al3(SO4)2(OH)6
25.6.20Tschermigite(NH4)Al(SO4)2 · 12H2O

Other Information

Notes:
Readily soluble in water. Taste alumlike, acid and sharp.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Alunogen

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Beudant, F.S. (1824) Trailé élémentaire de Minéralogie, 8vo, Paris: 449. [as Hydrotrisulfate d'alumine]
Mill (1828) Quarterly Journal of Science, Literature, and Art, London: 25: 382. [as Davite]
Beudant, F.S. (1832) Alunogène, sulfate d’alumine. Trailé élémentaire de Minéralogie, second edition, 2 volumes: 2: 488-492. [as Alunogène]
Shepard C.U. (1835) Treatise on Mineralogy. First edition: vols. 2, 3: 188. [as Solfatarite]
Glocker, E.F. (1839) Handbuch der Mineralogie, 2nd. edition, Nürnberg: 689. [as Keramohalite]
Huot, J.J. (1841) Manuel de Minéralogie. 2 volumes, Paris: 2: 451. [as Saldanite]
Glocker, E.F. (1847) Generum et specierum mineralien secundum ordines naturals digestorum synopsis. Halle: 297. [as Stypterit]
Hausmann, J.F.L. (1847) Handbuch der Mineralogie 3 volumes, Göttingen. Second edition: vol. 2, in two parts: 2: 1174. [as Halotrichit]
Rammelsberg, C.F. (1875) Handbuch der Mineralchemie. second edition: 269. [as Haarsalz]
Jirkovsky (1928) cited in Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 106.
Larsen, E.S., Steiger, G. (1928) Dehydration and optical studies of alunogen, nontronite, and griffithite: American Journal of Science, 5th. series: 15: 1-19.
Lausen, C. (1928) Hydrous sulphates formed under fumerolic conditions at the United Verde Mine. American Mineralogist: 13: 208.
Hintze, C. (1929) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [3B]: 4404.
Petrov (1933) Trav. Inst. Pétrog. Ac. Sc. U.R.S.S., no. 3: 89.
Zavaritsky (1935) Trans. Centr. Geol. & Prosp. Inst., Leningrad, no. 35.
Gordon, S.G. (1942) Results of the Chilean mineralogical expedition of 1938. Part VII.—The crystallography of alunogen, meta-alunogen and pickeringite. Notulae Naturae of The Academy of Natural Sciences of Philadelphia: 101: 1-9.
Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 537-540.
Menchetti, S., Sabelli, C. (1974) Alunogen. Its structure and twinning. Tschermaks Mineralogische und Petrographische Mitteilungen: 21: 164-178.
Fang, J.H., Robinson, P.D. (1976) Alunogen, Al2(H2O)12(SO4)3·5H2O: Its atomic arrangement and water content. American Mineralogist: 61: 311-317.
Bariand, P., Cesbron, F., Berthelon, J.-P. (1977) Les sulfates de fer de Saghand près de Yazd (Iran). Mémoire Hors-Série de la Société Géologique de France: 8: 77-85.

Internet Links for Alunogen

mindat.org URL:
https://www.mindat.org/min-162.html
Please feel free to link to this page.

Localities for Alunogen

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 23, 2017 09:52:36 Page generated: July 22, 2017 09:10:22
Go to top of page