Changoite Mineral Data

Changoite Mineral Data

[Thumbnails] [Miniatures] [Cabinets] [About Us] [FAQ]
Welcome To Mason's Minerals
Your Source for Beautiful Minerals and Crystals
We offer a no-questioned-asked Satisfaction Guarantee

General Changoite Information

Chemical Formula:

Na2Zn(SO4)2·4(H2O)

Composition:

Molecular Weight = 375.56 gm

Sodium 12.24 % Na 16.50 % Na₂O

Zinc 17.41 % Zn 21.67 % ZnO

Hydrogen 2.15 % H 19.19 % H₂O

Sulfur 17.08 % S 42.64 % SO₃

Oxygen 51.12 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Zn(SO₄)₂·4(H₂O)

Environment:

Found as a product of oxidation in an old mining area. The zinc-dominant analogue of blödite and nickelblödite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

2 km west of Sierra Gorda, northeast of Antofagasta, northern Chile. Link to MinDat.org Location Data.

Name Origin:

Named after the changos, the early former inhabitants of northern Chile.

Synonym:

IMA1997-041

Search for Changoite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Changoite Crystallography

Axial Ratios:

a:b:c =1.3428:1:0.6706

Cell Dimensions:

a = 11.077, b = 8.249, c = 5.532, Z = 2; beta = 100.183° V = 497.52 Den(Calc)= 2.51

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.289(1), 4.55(0.58), 3.262(0.35),

Physical Properties of Changoite

Color:

Colorless.

Density:

2.5

Diaphaniety:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Water Soluble - Water soluble mineral.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Changoite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.2048,KC= 0.2063

Optical Data:

Biaxial (-), a=1.507, b=1.512, g=1.517, bire=0.0100

Calculated Properties of Changoite

Electron Density:

r_electron=2.50 gm/cc
note: r_Changoite=2.50 gm/cc.

Fermion Index

Fermion Index = 0.00866
Boson Index = 0.99134

Photoelectric:

PE_Changoite= 9.60 barns/electron
U=PE_Changoite x r_electron= 24.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Changoite is Not Radioactive

Changoite Classification

Dana Class:

29.3.3.5 (29)Hydrated Acid and Sulfates

(29.3)where (A+)2 B (XO4)2 · x(H2O)

(29.3.3)Dana Group

29.3.3.1 Blodite Na2Mg(SO4)2·4(H2O) P 2₁/a 2/m

29.3.3.2 Nickelblodite Na2(Ni,Mg)(SO4)2·4(H2O) P 2₁/a 2/m

29.3.3.3 Leonite K2Mg(SO4)2·4(H2O) C 2/m 2/m

29.3.3.4 Mereiterite! K2Fe(SO4)2·4(H2O) C 2/m 2/m

29.3.3.5 Changoite ! Na2Zn(SO4)2·4(H2O) P 2₁/a 2/m

Strunz Class:

VI/C.18-25 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.18 - Blödite - Konyaite series

VI/C.18-10 Blodite Na2Mg(SO4)2·4(H2O) P 2₁/a 2/m

VI/C.18-20 Nickelblodite Na2(Ni,Mg)(SO4)2·4(H2O) P 2₁/a 2/m

VI/C.18-25 Changoite Na2Zn(SO4)2·4(H2O) P 2₁/a 2/m

VI/C.18-30 Leonite K2Mg(SO4)2·4(H2O) C 2/m 2/m

VI/C.18-40 Konyaite Na2Mg(SO4)2·5(H2O) P 2₁/c 2/m

Other Changoite Information

References:

NAME( CanMin 8/1999) PHYS. PROP.(AmMin, V84, p. 1685) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Changoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

Search for Changoite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Changoite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Changoite Mineral Data :

Ask about Changoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Changoite Specimen Label here :

Changoite

Na2Zn(SO4)2·4(H2O)
Dana No: 29.3.3.5 Strunz No: VI/C.18-25
Locality:

Notes: