Dresserite Mineral Data

General Dresserite Information

Chemical Formula:

BaAl2(CO3)2(OH)4•(H2O)

Composition:

Molecular Weight = 397.35 gm

Barium 34.56 % Ba 38.59 % BaO

Aluminum 13.58 % Al 25.66 % Al₂O₃

Hydrogen 1.52 % H 13.60 % H₂O

Carbon 6.05 % C 22.15 % CO₂

Oxygen 44.29 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl₂(CO₃)₂(OH)₄•(H₂O)

Environment:

Vugs in an alkalic sill in limestone.

IMA Status:

Approved IMA 1970

Locality:

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

Name Origin:

Named for John Alexander Dresser (1866-1954), Canadian geologist who contributed to knowledge of the Monteregian Hills.

Name Pronunciation:

Dresserite + Pronunciation

Synonym:

IMA1968-027

Dresserite Image

Images:

Dresserite

Comments: Radiating spheres of dresserite on matrix.
Location: Francon Quarry, Montreal, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Dresserite

Comments: White divergent sprays of fibrous crystals dresserite crystals.
Location: Francon quarry, MontrÃ©al, Jacques Cartier Co., QuÃ©bec, Canada. Scale: Crystal size 5mm.
© Tom Loomis / Dakota Matrix

Dresserite Crystallography

Axial Ratios:

a:b:c =0.5508:1:0.3345

Cell Dimensions:

a = 9.27, b = 16.83, c = 5.63, Z = 4; V = 878.36 Den(Calc)= 3.00

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): 8.09(1), 6.23(0.6), 3.66(0.5),

Physical Properties of Dresserite

Color:

White.

Density:

2.96

Diaphaneity:

Transparent

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Dresserite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1865,KPDmeas= 0.189,KC= 0.1955
Ncalc = 1.58 - 1.59

Optical Data:

Biaxial (-), a=1.518, g=1.601, bire=0.0830, 2V(Meas)=30-40.

Calculated Properties of Dresserite

Electron Density:

Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Dresserite =2.96 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Dresserite= 146.94 barns/electron
U=PE_Dresserite x rElectron Density= 411.57 barns/cc.

Radioactivity:

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

Dresserite Classification

Dana Class:

16b.02.01.02 (16b)Carbonates - Hydroxyl or Halogen

(16b.02)where (A)m (B)n (XO3)p Zq ï¿½ 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 Dresserite 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 Dresserite :
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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Dresserite

BaAl2(CO3)2(OH)4•(H2O)
Dana No: 16b.02.01.02 Strunz No: 05.DB.10
Locality:

Notes:

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