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Lachlan M.D. Cranswick
MgSO4 · 4H2O
The name is in honour of Lachlan M.D. Cranswick (1968–2010) who helped to develop and maintain the Collaborative Computational Project No. 14 in Powder and Small Molecule Single Crystal Diffraction (CCP14). Lachlan was expert in powder X-ray and neutron diffraction using the Rietveld method.
Dimorph of:
Formerly referred to as "β-Starkeyite"

Classification of Cranswickite

Approved 2010

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

6 : AXO4·xH2O URL:
Please feel free to link to this page.

Type Occurrence of Cranswickite

Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Ontario, Canada, accession number 55368

Crystallography of Cranswickite

Crystal System:
Class (H-M):
m - Domatic
Space Group:
Space Group Setting:
Cell Parameters:
a = 11.9172(4) Å, b = 5.1704(1) Å, c = 12.1880(3) Å
β = 117.538(2)°
a:b:c = 2.305 : 1 : 2.357
Unit Cell Volume:
V 665.90 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
5.284 (100)
4.62 (33)
3.983 (25)
3.940 (49)
3.176 (50)
3.127 (24)
2.575 (26)
1.952 (22)

Chemical Properties of Cranswickite

MgSO4 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Cranswickite to other Species

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.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.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.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.90MeridianiiteMgSO4 · 11H2O

Other Names for Cranswickite

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 Cranswickite

Reference List:
ZVMO 128(4), 99 (1999) [American Mineralogist 85, 1564 (2000)(abstract)]

Peterson, R. C. (2010). Cranswickite, IMA 2010-016. CNMNC Newsletter, August 2010, page 798; Mineralogical Magazine 74, 797-800.

Peterson, R. C. (2011) Cranswickite MgSO4·4H2O, a new mineral from Calingasta, Argentina. American Mineralogist, 96, 869-877.

Internet Links for Cranswickite

Localities for Cranswickite

(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 (TL)
  • San Juan
    • Calingasta Department
Peterson (2010)
        • Sierra del Tontal
Ron C. Peterson (2011) Cranswickite MgSO4.4H2O, a new mineral from Calingasta, Argentina
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