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Cranswickite

Collectors Summary

Color weiß
Solubility +++ H2O, Alkohol und säuren, an der Luft stabil, konvertiert beimmörsern zu Starkeyit
Crystal System monoklin, C2/c
Morphology weiche weiße Spaltenfüllung in metasedimentären Gesteinen

Chemism

Chem­ical formula

MgSO4·4H2O

Addi­tional chem. informa­tion

dimorph mit Starkeyit

Chem­ical com­po­si­tion

Magnesium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 192.429576 u; Number of atoms in the formula: 18

Info

Empirical formula:

MgSO4·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

4.19

8

44.44

1.0079470

8.0635760

Oxygen

O

66.52

8

44.44

15.9994300

127.9954400

Magnesium

Mg

12.63

1

5.56

24.3050600

24.3050600

Sulfur

S

16.66

1

5.56

32.0655000

32.0655000

Anal­y­sis wt%

SO3 : 41.59, MgO : 20.28, H2O : 37.90 (Ref: American Mineralogist 2011)

Strunz 9th edi­tion incl. updates

7.CB.15

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

Lapis Clas­sifica­tion

VI/C.03-015

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
C: Wasserhaltige Sulfate, ohne fremde Anionen
3: Mittelgroße Kationen; Rozenit-Reihe

Clas­sifica­tion by Hölzel

7.CB.105

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
1: Starkeyite-Group

IMA sta­tus

anerkannt - CNMNC Newsletter, July 2010

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

weiß

max. Birefrin­gence

0.005

Birefringence chart\! Cranswickite title=Birefringence chart Cranswickite

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

1.470

RI value γ / ε

1.475

Ri mean

1.473

2V angle

b ?

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

m

Space Group

C2/c

Cell param­e­ters a (Å)

11.917

Cell param­e­ters b (Å)

5.170

Cell param­e­ters c (Å)

12.188

Cell param­e­ters a/b or c/a

2.305

Cell param­e­ters c/b

2.357

Cell param­e­ters α

90°

Cell param­e­ters β

117.53

Cell param­e­ters γ

90°

Z

4

Volumne (ų)

665.887

Kristall struc­ture

aufgeklärt, neuer Strukturtyp, siehe Peterson, R.C. (2010)

X-Ray Pow­der Diffrac­tion

5.259 (100), 3.927 (46), 3.168 (45), 4.603 (29), 2.570 (23)

Morphol­ogy

weiche weiße Spaltenfüllung in metasedimentären Gesteinen

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hard­ness Vick­ers)

14 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

1.917 gem.. 1.918 berechnet

1.919 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ H2O, Alkohol und säuren, an der Luft stabil, konvertiert beimmörsern zu Starkeyit

Chem­ical Prop­er­ties and Tests

Infrarot- und Raman-Spektrum veröffentlicht, siehe Peterson, R.C. (2010), ähneln stark denen von Starkeyit.

(Co-)Type locality

(Co-)Type locality

Argentinien/San Juan, Provinz/Calingasta

Type mate­r­ial

Royal Ontario Museum, Toronto

Col­lec­tion number of type mate­r­ial

55368

Preface

Name from

Lachlan M. D. Cranswick (1968-2010), Professor der Kristallographie aus Österreich, der eine wichtige Rolle spielte für das Collaborative Computational Project No. 14 in Powder and Small Molecule Single Crystal Diffraction (CCP14).

Author (Name, Year)

Peterson, R.C. (2010)

References

Ronald C. Peterson: Cranswickite MgSO4•4H2O, a new mineral from Calingasta, Argentina. American Mineralogist 96 (2011) S.869-877.

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

Detailed description

Die Typlokalität befindet sich bei einem kleinen Abbau 1 km ESE von Calingasta

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

Ilesite

(Mn,Zn,Fe2+)SO4·4H2O

monoklin : 2/m : P21/n

7.CB.15

Aplowite

(Co,Mn,Ni)SO4·4H2O

monoklin : 2/m : P21/n

7.CB.15

Boyleite

(Zn,Mg)SO4·4H2O

monoklin : 2/m : P21/n

7.CB.15

Rozenite

Fe2+SO4·4H2O

monoklin : 2/m : P21/n

7.CB.15

'Starkeyite'

MgSO4·4H2O

monoklin : 2/m : P21/n

7.CB.15

Drobecite

CdSO4·4H2O

monoklin : 2/m : P21/m

7.CB.15

Cranswickite

MgSO4·4H2O

monoklin : m : C2/c

7.CB.15

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

'Starkeyite'

MgSO4·4H2O

monoklin : 2/m : P21/n

VI/C.03-010

Cranswickite

MgSO4·4H2O

monoklin : m : C2/c

VI/C.03-015

Rozenite

Fe2+SO4·4H2O

monoklin : 2/m : P21/n

VI/C.03-020

Ilesite

(Mn,Zn,Fe2+)SO4·4H2O

monoklin : 2/m : P21/n

VI/C.03-030

Aplowite

(Co,Mn,Ni)SO4·4H2O

monoklin : 2/m : P21/n

VI/C.03-040

Boyleite

(Zn,Mg)SO4·4H2O

monoklin : 2/m : P21/n

VI/C.03-050

Drobecite

CdSO4·4H2O

monoklin : 2/m : P21/m

VI/C.03-060

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

'Starkeyite'

MgSO4·4H2O

monoklin : 2/m : P21/n

7.CB.100

Cranswickite

MgSO4·4H2O

monoklin : m : C2/c

7.CB.105

Boyleite

(Zn,Mg)SO4·4H2O

monoklin : 2/m : P21/n

7.CB.120

Rozenite

Fe2+SO4·4H2O

monoklin : 2/m : P21/n

7.CB.130

Aplowite

(Co,Mn,Ni)SO4·4H2O

monoklin : 2/m : P21/n

7.CB.150

Ilesite

(Mn,Zn,Fe2+)SO4·4H2O

monoklin : 2/m : P21/n

7.CB.160

Drobecite

CdSO4·4H2O

monoklin : 2/m : P21/m

7.CB.170

Other languages

German

Cranswickit

English

Cranswickite

old name

UM1999-28-SO:HMg

IMA Number

IMA 2010-016

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Cranswickit
Google-Bilder-Suche - search for: Cranswickit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Cranswickit

English pages

Mindat - search for: Cranswickite
Webmineral - search for:Cranswickite
Handbook-of-Mineralogy - search for: Cranswickite
RRUFF - Raman, XRD and other mineral data - search for: Cranswickite
RRUFF - References and PDF downloads - search for: Cranswickite
American-Mineralogist-Crystal-Structure-Database - search for: Cranswickite
Athena - search for: Cranswickite

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Cranswickit
Crystal-Treasure.com - search for: Cranswickit
Bosse - search for: Cranswickit

Locations with GPS information