Strontiodresserite Mineral Data

Strontiodresserite Mineral Data

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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)

IMA Status:

Approved IMA 1977

Locality:

Link to MinDat.org Location Data.

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 - DipyramidalH-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

Diaphaniety:

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

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:

r_electron=2.67 gm/cc
note: r_{Strontiodresserite}=2.71 gm/cc.

Fermion Index

Fermion Index = 0.01478
Boson Index = 0.98522

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strontiodresserite is Not Radioactive

Strontiodresserite Classification

Dana Class:

16b.2.1.3 (16b)Carbonates - Hydroxyl or Halogen

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

(16b.2.1)Dana Group

16b.2.1.1 Dundasite PbAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

16b.2.1.2 Dresserite BaAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

16b.2.1.3 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

16b.2.1.4 Petterdite! PbCr2(CO3)2(OH)4·H2O Pbnm 2/m 2/m 2/m

16b.2.1.5 Kochsandorite! CaAl2(CO3)2(OH)4·H2O P nma 2/m 2/m 2/m

Strunz Class:

V/E.08-50 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.08 - Strontiodresserite - Dundasite series

V/E.08-05 Thomasclarkite-(Y)! (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) P 2 2

V/E.08-10 Kamphaugite-(Y) Ca(Y,REE)(CO3)2(OH)2·3(H2O) P 4₁2₁2 4 2 2

V/E.08-20 Calcio-ancylite-(Ce) CaCe(CO3)2(OH)·(H2O) P mmm 2/m 2/m 2/m

V/E.08-25 Calcio-ancylite-(Nd) CaNd(CO3)2(OH)·(H2O) Pm m

V/E.08-28 Ancylite-(La)! Sr(La,Ce)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-30 Ancylite-(Ce) SrCe(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-40 Gysinite-(Nd) Pb(Nd,La)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-50 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-60 Dresserite BaAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-70 Hydrodresserite BaAl2(CO3)2(OH)4·3(H2O) P1 1

V/E.08-80 Montroyalite Sr4Al8(CO3)3(OH,F)26·10-11(H2O) Unk. Tri

V/E.08-90 Dundasite PbAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-95 Petterdite! PbCr2(CO3)2(OH)4·H2O Pbnm 2/m 2/m 2/m

V/E.08-100 Barstowite Pb4(CO3)Cl6·(H2O) P 2₁/m 2/m

Other Strontiodresserite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Strontiodresserite

(Sr,Ca)Al2(CO3)2(OH)4·(H2O)
Dana No: 16b.2.1.3 Strunz No: V/E.08-50
Locality:

Notes: