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 GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember 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

Pentahydrite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
MgSO4 · 5H2O
System:
Triclinic
Colour:
Colourless, pale blue
Hardness:
Name:
In allusion to its chemical composition having five (PENTA-) molecules of water (HYDR-) in its formula.

Classification of Pentahydrite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7.CB.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
29.6.7.3

29 : HYDRATED ACID AND NORMAL SULFATES
6 : AXO4·xH2O
25.3.4

25 : Sulphates
3 : Sulphates of Mg
mindat.org URL:
http://www.mindat.org/min-3153.html
Please feel free to link to this page.

Type Occurrence of Pentahydrite

Year of Discovery:
1951

Physical Properties of Pentahydrite

Vitreous
Colour:
Colourless, pale blue
Streak:
White
Hardness (Mohs):

Crystallography of Pentahydrite

Crystal System:
Triclinic
Cell Parameters:
a = 6.33Å, b = 10.55Å, c = 6.07Å
α = 99.17°, β = 109.88°, γ = 75°
Ratio:
a:b:c = 0.6 : 1 : 0.575

Optical Data of Pentahydrite

Type:
Biaxial (-)
RI values:
nα = 1.482 nβ = 1.492 nγ = 1.493
2V:
Measured: 45° , Calculated: 34°
Max Birefringence:
δ = 0.011
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 Pentahydrite

Formula:
MgSO4 · 5H2O
Essential elements:
All elements listed in formula:

Relationship of Pentahydrite to other Species

Other Members of Group:
ChalcanthiteCuSO4 · 5H2O
JôkokuiteMnSO4 · 5H2O
SiderotilFeSO4 · 5H2O
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.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.45AlunogenAl2(SO4)3 · 17H2O
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+Fe23+(SO4)4 · 14H2O
7.CB.80RansomiteCuFe2(SO4)4 · 6H2O
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2O
7.CB.85BíliniteFe2+Fe23+(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
25.3.1KieseriteMgSO4 · H2O
25.3.2SanderiteMgSO4 · 2H2O
25.3.3StarkeyiteMgSO4 · 4H2O
25.3.5HexahydriteMgSO4 · 6H2O
25.3.6EpsomiteMgSO4 · 7H2O
25.3.7CaminiteMg7(SO4)5(OH)4 · H2O
25.3.8VanthoffiteNa6Mg(SO4)4
25.3.9BlöditeNa2Mg(SO4)2 · 4H2O
25.3.10KonyaiteNa2Mg(SO4)2 · 5H2O
25.3.11LöweiteNa12Mg7(SO4)13 · 15H2O
25.3.12UklonskoviteNaMg(SO4)F · 2H2O
25.3.13LangbeiniteK2Mg2(SO4)3
25.3.14LeoniteK2Mg(SO4)2 · 4H2O
25.3.15PicromeriteK2Mg(SO4)2 · 6H2O
25.3.16Efremovite(NH4)2Mg2(SO4)3
25.3.17Boussingaultite(NH4)2Mg(SO4)2 · 6H2O
25.3.18PickeringiteMgAl2(SO4)4 · 22H2O

Other Names for Pentahydrite

Name in Other Languages:

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.

References for Pentahydrite

Reference List:
Hobbs (1905) American Geologist, Minneapolis (1888-1905): 36: 184 (as Epsomite).

Keller (1908) Proceedings of the American Philosophical Society: 47: 81 (as Double Sulphate of Copper and Magnesium).

Allen and Day (1927) Carnegie Institute Washington Publication: 378: 42.

Milton and Johnston (1938) Economic Geology 33: 749.

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.: 492.

American Mineralogist (1951) 36: 641.

Acta Crystallographica B28: 1448-1455.

Peterson, R.C., Hammarstrom, J.M., Seal, R.R., II (2006): Alpersite (Mg,Cu)SO4•7H2O, a new mineral of the melanterite group, and cuprian pentahydrite: their occurrence within mine waste. American Mineralogist 91, 261-269.

Internet Links for Pentahydrite

Localities for Pentahydrite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Argentina
 
  • San Juan
    • Iglesia Department
Bengochea, L. y Mas, G. (1998), Aparición de jarlita y sulfatos secundarios en el Valle del Cura, Argentina. Boletín de la Sociedad Española de Mineralogía, 21-A. Resúmenes de comunicaciones del Congreso de Mineralogía y Petrología, SEM 98 y 18° Reunión de la SEM, pág. 44-45.
Austria
 
  • Salzburg
    • Hohe Tauern
      • Gastein valley
        • Bad Hofgastein
A. Strasser: Die Minerale Salzburgs, 1989
  • Tyrol
    • North Tyrol
      • Inn valley
        • Innsbruck
          • Hall
            • Hall valley
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
  • Upper Austria
    • Gmunden
      • Hallstatt
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
Germany
 
  • Saxony-Anhalt
    • Stassfurt Potash deposit
      • Egeln
        • Tarthun
No reference listed
  • Saxony
    • Erzgebirge
      • Schlema-Hartenstein District
T. Witzke (1992): Neues zu den Mineralien von Schlema-Hartenstein und der Grube König David, Schneeberg, Erzgebirge.- Mineralien-Welt 3(6), 16-18
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
Hungary
 
  • Heves Co.
    • Mátra Mts
      • Recsk
Szakáll & Kovács,2007
Namibia
 
  • Erongo Region
    • Swakopmund District
      • Arandis
        • Rössing Mountains Area
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. 335 pp (in English).
  • Khomas Region
    • Windhoek District
      • Windhoek
        • Friedenau Farm 16
DILL, H.G., PÖLLMANN, H. , BOSECKER, K., HAHN, L. and MWIYA, S.(2002) Supergene mineralization in mining residues of the Matchless cupreous pyrite deposit (Namibia) – A clue to the origin of modern and fossil duricrusts in semiarid climates.- Journal of Geochemical Exploration, 75: 43-70
Norway
 
  • Telemark
    • Skien
      • Flakvarp
        • Torsberg
Larsen, A.O. (1993): Gruver og skjerp i Skien. Stathelle 1993. 72p. (p. 60)., Raade, G. Sæbø, P. Chr. (1990): Pentahydrite, MgS04*5H2O, from Dragehullert, Porsgrunn. Interne notater 1961-1990. Mineralogisk-Geologisk Museum, UiO, Oslo,p.149
Peru
 
  • Tacna Department
    • Jorge Basadre Province
Diaby, N., Dold, B., Buselli, E., & Vicetti, R. (2006). EFFECTS ON ELEMENT MOBILITY BY THE CONSTRUCTION OF A WETLAND ON THE MARINE SHORE PORPHYRY COPPER TAILINGS DEPOSIT, BAHÍA DE ITE, PERU. In 7th International Conference on Acid Rock Drainage (ICARD), March (pp. 26-30).
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Cesnokov, B., M. Kotrly, and T. Nisanbajev (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Senegal
 
  • Ziguinchor Region
Montoroi, J. P. (1995) Mise eli évidence d'une séquence de précipitation des sels dails les sols sulfatés acides d'une vallée aménagée de Basse-Casamance (Sénégal). C.R. Acad. Sci. Paris, t. 320, série II a, p. 395-402
USA
 
  • Arizona
    • Coconino Co.
      • Grand Canyon District
Quick, T.J., R.G. Corbett, and B.M. Manner (1989) Efflorescent minerals occurring in the gorge of the Grand Canyon, Abstract with Programs, Geological Society of America: 21(4): 44-45; Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 7.
  • California
    • Alameda Co.
      • Diablo Range
        • Oakland Hills
          • Oakland
            • Leona Heights
              • Leona Heights deposit
Jeffrey Weissman collection
    • Sonoma Co.
      • Mayacmas Mts (Mayacamas Mts)
        • West Mayacmas District
Allen, Eugene T. & Arthur L. Day (1927), Steam wells and other thermal activity at “The Geysers,” California: Carnegie Institute Washington Publication 378: 39, 45; Vonsen, Magnus (1941) Preliminary report on minerals of The Geysers of Sonoma County, California. Mineralogist: 9: 246, 247; Vonsen, Magnus (1946), Minerals at “The Geysers,” Sonoma County, California: California Division Mines Report 42: 290; 87-293; 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: 492.
  • Colorado
    • Mesa Co.
Minerals of Colorado (1997) Eckel, E. B.
    • Teller Co.
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: 492.
  • Montana
    • Mineral Co.
      • Alberton
        • Fish Creek
Econ Geol (2004) 99:1727-1744
  • Nevada
    • Storey Co.
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: 492; Rocks & Minerals: 74(6): 380-390.
  • Virginia
    • Louisa Co.
      • Gold-Pyrite Belt
        • Mineral
Minerals of Virginia 1990 by R. V. Dietrich
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 1993-2015, 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: August 31, 2015 07:53:02 Page generated: August 30, 2015 23:18:49