Strontiodresserite Mineral Data

General Strontiodresserite Information

Chemical Formula:

(Sr,Ca)Al2(CO3)2(OH)4•(H2O)

Composition:

Molecular Weight = 335.76 gm

Strontium 19.57 % Sr 23.15 % SrO

Calcium 2.98 % Ca 4.18 % CaO

Aluminum 16.07 % Al 30.37 % Al₂O₃

Hydrogen 1.80 % H 16.10 % H₂O

Carbon 7.15 % C 26.21 % CO₂

Oxygen 52.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr_0.75Ca_0.25Al₂(CO₃)₂(OH)₄•(H₂O)

Environment:

Crystalline coating in vugs in a silicocarbonatite sill.

IMA Status:

Approved IMA 1977

Locality:

Francon quarry, Montreal Island, Montreal, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named as the strontium analog of dresserite.

Synonym:

IMA1977-005

Strontiodresserite Image

Images:

Strontiodresserite

Comments: Opaque white spherical strontiodresserite, with radial structure.
Location: Francon Quarry, Montreal, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Strontiodresserite Crystallography

Axial Ratios:

a:b:c =0.5744:1:0.3516

Cell Dimensions:

a = 9.14, b = 15.91, c = 5.594, Z = 4; V = 813.46 Den(Calc)= 2.74

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbmm

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

By Intensity(I/I_o): 7.93(1), 4.39(0.8), 3.002(0.7),

Physical Properties of Strontiodresserite

Color:

White.

Density:

2.71

Diaphaneity:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Strontiodresserite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2054,KPDmeas= 0.2076,KC= 0.2152
Ncalc = 1.58 - 1.59

Optical Data:

Biaxial (-), a=1.51, b=1.583, g=1.595, bire=0.0850, 2V(Calc)=42, 2V(Meas)=42.5.

Calculated Properties of Strontiodresserite

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Strontiodresserite =2.71 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Strontiodresserite}= 21.97 barns/electron
U=PE_{Strontiodresserite} x rElectron Density= 58.68 barns/cc.

Radioactivity:

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

Strontiodresserite Classification

Dana Class:

16b.02.01.03 (16b)Carbonates - Hydroxyl or Halogen

(16b.02)where (A)m (B)n (XO3)p Zq � x(H2O), with (m+n):p=3:2

(16b.02.01)Dundasite Group

16b.02.01.01 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.02 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.03 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

16b.02.01.04 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

16b.02.01.05 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

Strunz Class:

05.DB.10 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DB -With large and medium-sized cations

05.DB.10 Dresserite BaAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Dundasite PbAl2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Kochsandorite! CaAl2(CO3)2(OH)4•H2O P nma 2/m 2/m 2/m

05.DB.10 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4•(H2O) Pbmm 2/m 2/m 2/m

05.DB.10 Petterdite! PbCr2(CO3)2(OH)4•H2O Pbnm 2/m 2/m 2/m

Other Strontiodresserite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Strontiodresserite :
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

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Strontiodresserite

(Sr,Ca)Al2(CO3)2(OH)4•(H2O)
Dana No: 16b.02.01.03 Strunz No: 05.DB.10
Locality:

Notes:

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