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Alpersite

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About AlpersiteHide

Formula:
Mg(SO4) · 7H2O
Mg is usually replaced by minor Cu.
Colour:
Blue, pale blue, whitish
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Honouring Charles N. Alpers (1958-), geochemist with the United States Geological Survey, for his contributions to the understanding of the mineralogical controls of mine-water geochemistry.

Classification of AlpersiteHide

Approved
Approval Year:
2003
First Published:
2006
7.CB.35

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

Physical Properties of AlpersiteHide

Vitreous
Transparency:
Transparent
Colour:
Blue, pale blue, whitish

Optical Data of AlpersiteHide

Type:
Biaxial (+)
RI values:
nα = 1.462 nβ = 1.465 nγ = 1.469
2V:
Measured: 79° , Calculated: 82°
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

Chemical Properties of AlpersiteHide

Formula:
Mg(SO4) · 7H2O

Mg is usually replaced by minor Cu.
IMA Formula:
(Mg,Cu)(SO4) · 7H2O
Common Impurities:
Zn,Mn,Fe

Crystallography of AlpersiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 14.166 Å, b = 6.534 Å, c = 10.838 Å
β = 105.922°
Ratio:
a:b:c = 2.168 : 1 : 1.659
Unit Cell V:
964.69 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.85Å(100)
4.79Å(14)
4.44Å(16)
3.779Å(38)
3.663Å(15)
3.254Å(15)
3.078Å(14)
2.721Å(14)
Comments:
From type description

Type Occurrence of AlpersiteHide

Associated Minerals at Type Locality:
Reference:
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.

Synonyms of AlpersiteHide

Other Language Names for AlpersiteHide

Relationship of Alpersite to other SpeciesHide

Other Members of this group:
BieberiteCoSO4 · 7H2OMon. 2/m : P2/m
BoothiteCuSO4 · 7H2OMon.
MallarditeMnSO4 · 7H2OMon. 2/m : P2/m
MelanteriteFe2+(H2O)6SO4 · H2OMon. 2/m : P21/b
Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Alpersite associated with Slavíkite(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2O

Related Minerals - Nickel-Strunz GroupingHide

7.CB.05Dwornikite(Ni,Fe)SO4 · H2OMon. 2/m : B2/b
7.CB.05GunningiteZnSO4 · H2OMon. 2/m : B2/b
7.CB.05KieseriteMgSO4 · H2OMon. 2/m
7.CB.05Poitevinite(Cu,Fe)SO4 · H2OTric.
7.CB.05SzmikiteMnSO4 · H2OMon.
7.CB.05SzomolnokiteFeSO4 · H2OMon. 2/m : B2/b
7.CB.05CobaltkieseriteCoSO4 · H2OMon. 2/m : B2/b
7.CB.07SanderiteMgSO4 · 2H2OOrth. 2 2 2 : P21 21 21
7.CB.10BonattiteCuSO4 · 3H2OMon.
7.CB.15Aplowite(Co,Mn,Ni)SO4 · 4H2OMon. 2/m
7.CB.15Boyleite(Zn,Mg)SO4 · 4H2OMon. 2/m : P21/b
7.CB.15Ilesite(Mn,Zn,Fe)SO4 · 4H2OMon. 2/m
7.CB.15RozeniteFeSO4 · 4H2OMon. 2/m : P21/b
7.CB.15StarkeyiteMgSO4 · 4H2OMon. 2/m : P21/b
7.CB.15DrobeciteCdSO4 · 4H2OMon. 2/m : P21/m
7.CB.15CranswickiteMgSO4 · 4H2OMon. m : Bb
7.CB.20ChalcanthiteCuSO4 · 5H2OTric. 1 : P1
7.CB.20JôkokuiteMnSO4 · 5H2OTric.
7.CB.20PentahydriteMgSO4 · 5H2OTric.
7.CB.20SiderotilFeSO4 · 5H2OTric.
7.CB.25Bianchite(Zn,Fe)SO4 · 6H2OMon. 2/m : P2/m
7.CB.25Chvaleticeite(Mn,Mg)SO4 · 6H2OMon. 2/m : B2/b
7.CB.25FerrohexahydriteFeSO4 · 6H2OMon. 2/m : B2/b
7.CB.25HexahydriteMgSO4 · 6H2OMon. 2/m : P2/m
7.CB.25Moorhouseite(Co,Ni,Mn)SO4 · 6H2OMon.
7.CB.25Nickelhexahydrite(Ni,Mg,Fe)SO4 · 6H2OMon.
7.CB.30RetgersiteNiSO4 · 6H2OTet. 4 2 2 : P41 21 2
7.CB.35BieberiteCoSO4 · 7H2OMon. 2/m : P2/m
7.CB.35BoothiteCuSO4 · 7H2OMon.
7.CB.35MallarditeMnSO4 · 7H2OMon. 2/m : P2/m
7.CB.35MelanteriteFe2+(H2O)6SO4 · H2OMon. 2/m : P21/b
7.CB.35Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2OMon.
7.CB.40EpsomiteMgSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.40GoslariteZnSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.40MorenositeNiSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.45AlunogenAl2(SO4)3 · 17H2OTric. 1
7.CB.45Meta-alunogenAl2(SO4)3 · 12H2O
7.CB.50AluminocoquimbiteAl2Fe2(SO4)6(H2O)12·6H2OTrig. 3m (3 2/m) : P3 1c
7.CB.55CoquimbiteAlFe3(SO4)6(H2O)12·6H2OTrig. 3m (3 2/m) : P3 1c
7.CB.55ParacoquimbiteFe4(SO4)6(H2O)12· 6H2OTrig. 3 : R3
7.CB.55Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.CB.60KorneliteFe2(SO4)3 · 7H2OMon. 2/m : P21/m
7.CB.65QuenstedtiteFe2(SO4)3 · 11H2OTric. 1 : P1
7.CB.70LauseniteFe2(SO4)3·5H2OMon. 2/m : P21/m
7.CB.75LishizheniteZnFe2(SO4)4 · 14H2OTric. 1 : P1
7.CB.75RömeriteFe2+Fe3+2(SO4)4 · 14H2OTric. 1 : P1
7.CB.80RansomiteCuFe2(SO4)4 · 6H2OMon. 2/m : P21/b
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2OMon.
7.CB.85BíliniteFe2+Fe3+2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85HalotrichiteFeAl2(SO4)4 · 22H2OMon. 2 : P2
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2OMon.
7.CB.85Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2OMon.
7.CB.90MeridianiiteMgSO4 · 11H2OTric. 1 : P1

Other InformationHide

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 AlpersiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Fortes, A.D., Browning, F., Wood, I.G. (2012) Cation substitution in synthetic meridianiite (MgSO4•11H2O) I: X-ray powder diffraction analysis of quenched polycrystalline aggregates. Physics and Chemistry of Minerals: 39: 419-441.

Internet Links for AlpersiteHide

Localities for AlpersiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Georgiana Co.
      • Burraga
Leverett, P., & Williams, P. A. (2007). Unusual post-mining sulfates from the Peelwood and Lloyd mines, New South Wales, and a comment on wattevilleite. Australian Journal of Mineralogy.
Austria
 
  • Styria
    • Liezen District
      • Rottenmann
        • Bärndorf
Kolitsch, U. (2014): 1992) Alpersit und Slavikit vom Prenterwinkelgraben bei Barndorf, Paltental, Steiermark. P. 137 in Niedermayr, G. et al. (2014): Neue Mineralfunde aus Österreich LXIII. Carinthia II, 204./124., 65-146.
Canada
 
  • Manitoba
    • Sherridon District
Geological Association of Canada (2014) Abstracts Fredericton Vol 37
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion District Mines
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
India
 
  • Madhya Pradesh
    • Jabalpur division
      • Balaghat District
        • Baihar Tehsil
          • Padritola
Equeenuddin, Sk.Md. (2015): Occurrence of alpersite at Malanjkhand copper mine, India. Environmental Earth Sciences: 73(7): 3849-3853
Nicaragua
 
  • León Department
    • Cerro Negro volcano
Hynek, B. M., McCollom, T. M., Marcucci, E. C., Brugman, K. K., & Rogers, K. L. (2013, March). Assessing environmental controls on acid-sulfate alteration at active volcanoes in Nicaragua: applications to relic hydrothermal systems on mars. In 44th Lunar and Planetary Science Conference, March (pp. 18-22).
    • Momotombo volcano
Hynek, B. M., McCollom, T. M., Marcucci, E. C., Brugman, K., & Rogers, K. L. (2013). Assessment of environmental controls on acid‐sulfate alteration at active volcanoes in Nicaragua: Applications to relic hydrothermal systems on Mars. Journal of Geophysical Research: Planets, 118(10), 2083-2104.
Spain
 
  • Andalusia
    • Huelva
      • Minas de Riotinto
        • Rio Tinto Mines (Riotinto Mines)
Romero, A., I. Gonzalez & E. Galan (2006): The role of efflorescent sulfates in the storage of trace elements in stream waters polluted by acid mine-drainage: the case of Peña del Hierro, southwestern Spain. Can. Mineral. 44, 1431-1446.
      • Nerva
Romero, A., I. Gonzalez & E. Galan (2006): The role of efflorescent sulfates in the storage of trace elements in stream waters polluted by acid mine-drainage: the case of Pena del Hierro, southwestern Spain. Canadian Mineralogist 44, 1431-1446.
USA (TL)
 
  • Nevada
    • Pershing Co.
      • Tobin and Sonoma Range Mining District
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.
 
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