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Pentahydrite

Collectors Summary

Color weiß, hellblau, hellgrünblau
Streak color weiß
Hardness (Mohs) 2.5
Solubility +++ H2O, hydriert zu Epsomit
Crystal System triklin, P1

Chemism

Chem­ical formula

MgSO4·5H2O

Chem­ical com­po­si­tion

Magnesium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 210.4449 u; Number of atoms in the formula: 21

Info

Empirical formula:

MgSO4·5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

4.79

10

47.62

1.0079470

10.0794700

Oxygen

O

68.42

9

42.86

15.9994300

143.9948700

Magnesium

Mg

11.55

1

4.76

24.3050600

24.3050600

Sulfur

S

15.24

1

4.76

32.0655000

32.0655000

Anal­y­sis wt%

MgO : 17.91, SO3 : 38.13, H2O : 42.97 (Ref: Econ.Geol. 38)

Strunz 9th edi­tion incl. updates

7.CB.20

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
B: Mit ausschließlich mittelgroßen Kationen
20:Pentahydrit-Gruppe

Lapis Clas­sifica­tion

VI/C.04-010

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
4: Mittelgroße Kationen; Chalkanthit-Gruppe

Clas­sifica­tion by Hölzel

7.CB.200

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
C: Sulfates (-Anions +Water)
B: Vitriol-Group, Mg,Fe,Co,Ni,Mn,Cu,Zn-Sulfates with 4 to 7 Water
2: Pentahydrite-Group

Dana 8th edi­tion

29.06.07.03

29: Hydrated Acid and Sulfates
06: Hydrated Acid and Sulfates where A XO4 · x(H2O)
07: Chalchanthite Group (Triclinic: P-1)

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Chalcanthit group

Optical Properties

Color

weiß, hellblau, hellgrünblau

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent bis durchscheinend

max. Birefrin­gence

0.011

Birefringence chart\! Pentahydrite title=Birefringence chart Pentahydrite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.482

RI value β

1.492

RI value γ / ε

1.493

Ri mean

1.489

2V angle

Biaxial (-) 45°

Crystallography

Crystal Sys­tem

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell param­e­ters a (Å)

6.335

Cell param­e­ters b (Å)

10.55

Cell param­e­ters c (Å)

6.075

Cell param­e­ters a/b or c/a

0.600

Cell param­e­ters c/b

0.576

Cell param­e­ters α

99.17

Cell param­e­ters β

109.88

Cell param­e­ters γ

75.0

Z

2

Volumne (ų)

367.672

X-Ray Pow­der Diffrac­tion

5.84(20),
5.15(30),
4.93(100),
3.65(30),
3.26(40),
3.03(20),
2.95(30),
2.79(20)

XRD chart Pentahydrite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

2.5

Density (g/cm³)

1.9

1.901 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O, hydriert zu Epsomit

(Co-)Type locality

(Co-)Type locality

USA/Colorado/Teller Co./Cripple Creek District

Preface

Author (Name, Year)

Palache & Berman & Frondel, 1951

Addi­tional Informa­tion

sehr gut in Wasser löslich

References

Handbook of Mineralogy (Anthony et al.), 5 (2003), 534

IMA group assignments

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

'Sanderite'

MgSO4·2H2O

7.CB.20

Belogubite

CuZn(SO4)2·10H2O

triklin : 1 : P1

7.CB.20

Jôkokuite

MnSO4·5H2O

triklin : 1 : P1

7.CB.20

Siderotil

Fe(SO4)·5H2O

triklin : 1 : P1

7.CB.20

Chalcanthite

CuSO4·5H2O

triklin : 1 : P1

7.CB.20

Pentahydrite

MgSO4·5H2O

triklin : 1 : P1

7.CB.20

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Pentahydrite

MgSO4·5H2O

triklin : 1 : P1

VI/C.04-010

Siderotil

Fe(SO4)·5H2O

triklin : 1 : P1

VI/C.04-020

Jôkokuite

MnSO4·5H2O

triklin : 1 : P1

VI/C.04-030

Chalcanthite

CuSO4·5H2O

triklin : 1 : P1

VI/C.04-040

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Pentahydrite

MgSO4·5H2O

triklin : 1 : P1

7.CB.200

Chalcanthite

CuSO4·5H2O

triklin : 1 : P1

7.CB.210

Siderotil

Fe(SO4)·5H2O

triklin : 1 : P1

7.CB.230

Jôkokuite

MnSO4·5H2O

triklin : 1 : P1

7.CB.260

Related minerals "Dana 8. Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Bassanite

CaSO4·0.5H2O

monoklin : 2 : I2

29.06.01.01

Kieserite

MgSO4·H2O

monoklin : 2/m : C2/c

29.06.02.01

Szomolnokite

Fe2+SO4·H2O

monoklin : 2/m : C2/c

29.06.02.02

Szmikite

MnSO4·H2O

monoklin : 2/m : C2/c

29.06.02.03

Poitevinite

Cu(SO4)·H2O

triklin : 1 : P1

29.06.02.04

Gunningite

(Zn,Mn)SO4·H2O

monoklin : 2/m : C2/c

29.06.02.05

Dwornikite

(Ni,Fe2+)SO4·H2O

monoklin : 2/m : C2/c

29.06.02.06

Cobaltkieserite

Co[SO4]·H2O

monoklin : 2/m : C2/c

29.06.02.07

Gypsum

CaSO4·2H2O

monoklin : 2/m : I2/a

29.06.03.01

Bonattite

CuSO4·3H2O

monoklin : m : Cc

29.06.05.01

Rozenite

Fe2+SO4·4H2O

monoklin : 2/m : P21/n

29.06.06.01

'Starkeyite'

MgSO4·4H2O

monoklin : 2/m : P21/n

29.06.06.02

Ilesite

(Mn,Zn,Fe2+)SO4·4H2O

monoklin : 2/m : P21/n

29.06.06.03

Aplowite

(Co,Mn,Ni)SO4·4H2O

monoklin : 2/m : P21/n

29.06.06.04

Boyleite

(Zn,Mg)SO4·4H2O

monoklin : 2/m : P21/n

29.06.06.05

Chalcanthite

CuSO4·5H2O

triklin : 1 : P1

29.06.07.01

Siderotil

Fe(SO4)·5H2O

triklin : 1 : P1

29.06.07.02

Pentahydrite

MgSO4·5H2O

triklin : 1 : P1

29.06.07.03

Jôkokuite

MnSO4·5H2O

triklin : 1 : P1

29.06.07.04

Hexahydrite

MgSO4·6H2O

monoklin : 2/m : C2/c

29.06.08.01

Bianchite

(Zn,Fe2+)(SO4)·6H2O

monoklin : 2/m : C2/c

29.06.08.02

Ferrohexahydrite

Fe2+SO4·6H2O

monoklin : 2/m : C2/c

29.06.08.03

Nickelhexahydrite

(Ni,Mg,Fe2+)(SO4)·6H2O

monoklin : 2/m : A2/a

29.06.08.04

Moorhouseite

(Co,Ni,Mn)SO4·6H2O

monoklin : 2/m : C2/c

29.06.08.05

Chvaleticeite

(Mn2+,Mg)SO4·6H2O

monoklin : 2/m : C2/c

29.06.08.06

Retgersite

NiSO4·6H2O

tetragonal : 422, 422 : P41212, P43212

29.06.09.01

Other languages

Spanish

Pentahidrita

German

Pentahydrit

English

Pentahydrite

French

Pentahydrite

Russian

Пентагидрит

Alternative Name

Allenit

Allenita

Allenite

Epsomite (of Hobbs)

Magnesium Chalcanthite

Pentahydrita

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