Gugiaite Mineral Data

Gugiaite Mineral Data +

General Gugiaite Information

Chemical Formula:

Ca2BeSi2O7

Composition:

Molecular Weight = 257.33 gm

Calcium 31.15 % Ca 43.58 % CaO

Beryllium 3.50 % Be 9.72 % BeO

Silicon 21.83 % Si 46.70 % SiO₂

Oxygen 43.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Be(Si₂O₇)

IMA Status:

Approved IMA 1962

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 31234

PDF 15-199

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Gugiaite Crystallography

Axial Ratios:

a:c = 1:0.67617

Cell Dimensions:

a = 7.43, c = 5.024, Z = 2; V = 277.35 Den(Calc)= 3.08

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: P 42₁m

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

By Intensity(I/I_o): 2.765(1), 1.485(0.7), 1.709(0.7),

Crystal Structure:

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Yang Z , Fleck M , Pertlik F , Tillmanns E , Tao K , Neues Jahrbuch fur Mineralogie, Monatshefte , 2001 (2001) p.186-192, The crystal structure of natural gugiaite, Ca2BeSi2O7, Locality: skarn rocks in the Gugia alkaline complex, Liaoning Province, China, Note, z coordinate of Ca is altered to reproduce reported Ca-O bond lengths

Physical Properties of Gugiaite

Cleavage:

[010] Perfect, [001] Distinct, [110] Indistinct

Color:

Colorless.

Density:

3.03

Diaphaniety:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gugiaite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2169,KPDmeas= 0.2205,KC= 0.212

Optical Data:

Uniaxial (+), w=1.664, e=1.672, bire=0.0080.

Calculated Properties of Gugiaite

Electron Density:

r_electron=3.06 gm/cc
note: r_Gugiaite=3.08 gm/cc.

Fermion Index

Fermion Index = 0.04584
Boson Index = 0.95416

Photoelectric:

PE_Gugiaite= 4.70 barns/electron
U=PE_Gugiaite x r_electron= 14.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gugiaite is Not Radioactive

Gugiaite Classification

Dana Class:

55.4.2.6 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.4)with cations in [8] and lower coordination

(55.4.2)Fresnoite group

55.4.2.1 Fresnoite Ba2TiSi2O8 P 4bm 4mm

55.4.2.2 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

55.4.2.3 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

55.4.2.4 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

55.4.2.5 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

55.4.2.6 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

Strunz Class:

VIII/C.02-30 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.02 - Melilite group

VIII/C.02-10 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

VIII/C.02-14 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

VIII/C.02-15 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

VIII/C.02-30 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

VIII/C.02-40 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

VIII/C.02-50 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1

VIII/C.02-60 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

VIII/C.02-70 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4

VIII/C.02-80 Barylite BaBe2Si2O7 Pn21a mm2

VIII/C.02-85 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m

VIII/C.02-90 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

Other Gugiaite Information

References:

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

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Gugiaite

Ca2BeSi2O7
Dana No: 55.4.2.6 Strunz No: VIII/C.02-30
Locality:

Notes: