Roggianite Mineral Data

General Roggianite Information

Chemical Formula:

Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O)

Composition:

Molecular Weight = 540.72 gm

Calcium 14.82 % Ca 20.74 % CaO

Beryllium 1.67 % Be 4.63 % BeO

Aluminum 9.98 % Al 18.86 % Al₂O₃

Silicon 20.78 % Si 44.45 % SiO₂

Hydrogen 1.27 % H 11.33 % H₂O

Oxygen 51.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Be(OH)₂Al₂(Si₄O₁₃)•2.4(H₂O)

IMA Status:

Approved IMA 1969

Locality:

Type locality: in albitite dike at Alpe Rosso in Val Vigezzo about 1.5 km south of Orcesco, Novara Province, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after Aldo G. Roggiani, a teacher of natural sciences, who first found the mineral.

Name Pronunciation:

Roggianite + Pronunciation

Synonym:

Ginzburgite

ICSD 71349

PDF 39-366

Roggianite Image

Images:

Roggianite

Comments: Glassy white fibrous roggianite aggregate.
Location: Murzinka, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Roggianite Crystallography

Axial Ratios:

a:c = 1:0.49989

Cell Dimensions:

a = 18.332, c = 9.164, Z = 8; V = 3,079.67 Den(Calc)= 2.33

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mcm

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

By Intensity(I/I_o): 13.08(1), 6.13(0.8), 9.27(0.8),

Physical Properties of Roggianite

Cleavage:

{110} Perfect

Color:

Yellow, Yellowish white, White.

Density:

2.02

Diaphaneity:

Transparent to Translucent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Roggianite

Gladstone-Dale:

CI meas= -0.17 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2279,KPDmeas= 0.2629,KC= 0.2247
Ncalc = 1.45 - 1.52

Optical Data:

Uniaxial (+), w=1.527, e=1.535, bire=0.0080.

Calculated Properties of Roggianite

Electron Density:

Bulk Density (Electron Density)=2.34 gm/cc
note: Specific Gravity of Roggianite =2.33 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Roggianite= 2.94 barns/electron
U=PE_Roggianite x rElectron Density= 6.88 barns/cc.

Radioactivity:

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

Roggianite Classification

Dana Class:

77.01.07.04 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.07)Brewsterite and related species

77.01.07.01 Brewsterite-Sr (Sr,Ba)Al4Si12O32•10(H2O) P 2₁/m 2/m

77.01.07.01a Brewsterite-Ba! (Ba,Sr)Al2Si6O16•5(H2O) P 2₁/m,P 2₁ Mono

77.01.07.02 Yugawaralite CaAl2Si6O16•4(H2O) Pc m

77.01.07.03 Goosecreekite CaAl2Si6O16•5(H2O) P 2₁ 2

77.01.07.04 Roggianite Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O) I 4/mcm 4/m 2/m 2/m

Strunz Class:

09.GB.20 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GB -Chains of single connected 4-membered rings

09.GB.20 Roggianite Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O) I 4/mcm 4/m 2/m 2/m

Other Roggianite Information

References:

NAME( CanMin, v 35, p 1589) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Roggianite :
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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Print or Cut-and-Paste your Roggianite Specimen Label here :

Roggianite

Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O)
Dana No: 77.01.07.04 Strunz No: 09.GB.20
Locality:

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