Peretaite Mineral Data

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General Peretaite Information

Chemical Formula:

CaSb+++4O4(OH)2(SO4)2•2(H2O)

Composition:

Molecular Weight = 853.25 gm

Calcium 4.70 % Ca 6.57 % CaO

Antimony 57.08 % Sb 68.33 % Sb₂O₃

Hydrogen 0.71 % H 6.33 % H₂O

Sulfur 7.52 % S 18.77 % SO₃

Oxygen 30.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaSb₄O₄(OH)₂(SO₄)₂•2(H₂O)

Environment:

Secondary mineral in vugs in an antimony-bearing vein in silicified limestone.

IMA Status:

Approved IMA 1980

Locality:

Pereta, Tuscany, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Peretaite + Pronunciation

Synonym:

ICSD 100339

PDF 33-264

Peretaite Image

Images:

Peretaite

Comments: Clear, tabular, bladed, stellate spray of transparent peretaite crystals.
Location: Pereta mine, Scansano, Tuscany, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Peretaite Crystallography

Axial Ratios:

a:b:c =4.4017:1:1.8185

Cell Dimensions:

a = 24.641, b = 5.598, c = 10.18, Z = 4; beta = 95.95° V = 1,396.67 Den(Calc)= 4.06

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 12.19(1), 3.06(0.67), 2.451(0.31),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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Menchetti S , Sabelli C , American Mineralogist , 65 (1980) p.940-946, Peretaite, CaSb4O4(OH)2(SO4)2*2H2O: Its atomic arrangement and twinning

Physical Properties of Peretaite

Cleavage:

{100} Perfect

Color:

Colorless, White.

Density:

4.06

Diaphaneity:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Peretaite

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2071,KC= 0.2073
Ncalc = 1.84

Optical Data:

Biaxial (+), b=1.841

Calculated Properties of Peretaite

Electron Density:

Bulk Density (Electron Density)=3.71 gm/cc
note: Specific Gravity of Peretaite =4.06 gm/cc.

Fermion Index:

Fermion Index = 0.0007721997
Boson Index = 0.9992278003

Photoelectric:

PE_Peretaite= 184.76 barns/electron
U=PE_Peretaite x rElectron Density= 685.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Peretaite is Not Radioactive

Peretaite Classification

Dana Class:

31.06.04.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.06)where (A+ B++)5 (XO4)2 Zq·x(H2O)

(31.06.04)Dana Group

31.06.04.01 Peretaite CaSb4O4(OH)2(SO4)2•2(H2O) C 2/c 2/m

Strunz Class:

07.DF.45 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DF -With large and medium-sized cations

07.DF.45 Peretaite CaSb4O4(OH)2(SO4)2•2(H2O) C 2/c 2/m

Other Peretaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Peretaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Peretaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Peretaite Specimen Label here :

Peretaite

CaSb+++4O4(OH)2(SO4)2•2(H2O)
Dana No: 31.06.04.01 Strunz No: 07.DF.45
Locality:

Notes: