Roggianite Mineral Data

Roggianite Mineral Data +

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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.

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 DipyramidalH-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),

Crystal Structure:

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Giuseppetti G , Mazzi F , Tadini C , Galli E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1991 (1991) p.307-314, The revised crystal structure of roggianite: Ca2[Be(OH)2Al2Si4O13]<2.5H2O, Locality: Val Vigezzo, Novara, Italy

Physical Properties of Roggianite

Cleavage:

[110] Perfect

Color:

Yellow, Yellowish white, White.

Density:

2.02

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Roggianite

Electron Density:

r_electron=2.34 gm/cc
note: r_Roggianite=2.33 gm/cc.

Fermion Index

Fermion Index = 0.02681
Boson Index = 0.97319

Photoelectric:

PE_Roggianite= 2.94 barns/electron
U=PE_Roggianite x r_electron= 6.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roggianite is Not Radioactive

Roggianite Classification

Dana Class:

77.1.7.4 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.7)Brewsterite and related species

77.1.7.1 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 2₁/m 2/m

77.1.7.1a Brewsterite-Ba! (Ba,Sr)Al2Si6O16·5(H2O) P 2₁/m,P 2₁ Mono

77.1.7.2 Yugawaralite CaAl2Si6O16·4(H2O) Pc m

77.1.7.3 Goosecreekite CaAl2Si6O16·5(H2O) P 2₁ 2

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

Strunz Class:

VIII/J.19-10 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.19 - Roggianite series

VIII/J.19-10 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)

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Roggianite

Ca2[Be(OH)2Al2Si4O13]·<2·5(H2O)
Dana No: 77.1.7.4 Strunz No: VIII/J.19-10
Locality:

Notes: