Gobbinsite Mineral Data

Gobbinsite Mineral Data +

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General Gobbinsite Information

Chemical Formula:

(Na2,Ca)2K2Al6Si10O32·12(H2O)

Composition:

Molecular Weight = 1,339.93 gm

Potassium 6.13 % K 7.38 % K₂O

Sodium 4.29 % Na 5.78 % Na₂O

Calcium 1.79 % Ca 2.51 % CaO

Aluminum 12.48 % Al 23.59 % Al₂O₃

Silicon 20.96 % Si 44.84 % SiO₂

Hydrogen 1.81 % H 16.13 % H₂O

Oxygen 52.54 % O

______ ______

100.00 % 100.24 % = TOTAL OXIDE

Empirical Formula:

Na_2.5Ca_0.6K_2.1Al_6.2Si₁₀O₃₂·12(H₂O)

Environment:

Formed from sodium rich fluids, in basalts and related igneous rocks.

IMA Status:

Approved IMA 1982

Locality:

Basalt cliffs near Hills Port, south of the Gobbins area, County Antrim, Northern Ireland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 30975

PDF 35-559

Gobbinsite Image

Images:

Gobbinsite

Comments: White opaque crystalline gobbinsite in vug.
Location: Island Magee, County, Antrim, Northern Ireland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gobbinsite Crystallography

Axial Ratios:

a:b:c =1.0307:1:1.0374

Cell Dimensions:

a = 10.1027, b = 9.8016, c = 10.1682, Z = 1; V = 1,006.88 Den(Calc)= 2.21

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P mn2₁

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

By Intensity(I/I_o): 3.201(1), 4.116(1), 7.11(1),

Crystal Structure:

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Artioli G , Foy H , Mineralogical Magazine , 58 (1994) p.615-620, Gobbinsite from Magheramorne quarry, Northern Ireland, Locality: Magheramorne quarry, Northern Ireland

View Additional jPOWD Structure files for Gobbinsite
[1]

Physical Properties of Gobbinsite

Cleavage:

None

Color:

Lemon white, Chalky white, Light brown.

Density:

2.147

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gobbinsite

Gladstone-Dale:

CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.222,KPDmeas= 0.2285,KC= 0.2277

Optical Data:

Biaxial (-), a=1.489, b=1.489, g=1.494, bire=0.0050, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Gobbinsite

Electron Density:

r_electron=2.17 gm/cc
note: r_Gobbinsite=2.15 gm/cc.

Fermion Index

Fermion Index = 0.01007
Boson Index = 0.98993

Photoelectric:

PE_Gobbinsite= 2.09 barns/electron
U=PE_Gobbinsite x r_electron= 4.53 barns/cc.

Radioactivity:

GRapi = 89.22 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Gobbinsite - barely detectable

Gobbinsite Classification

Dana Class:

77.1.3.4 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.3)Gismondine and related species

77.1.3.1 Gismondine Ca2Al4Si4O16·9(H2O) P 2₁/c 2/m

77.1.3.2 Amicite K2Na2Al4Si4O16·5(H2O) I2 2

77.1.3.3 Garronite Na2Ca5Al12Si20O64·27(H2O) I 4₁/a 4/m

77.1.3.4 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn2₁ mm2

77.1.3.5 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.8 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m

77.1.3.9 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

77.1.3.9a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

77.1.3.9b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]·34(H2O) Im3m 4/m 3 2/m

77.1.3.10 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.3.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m

77.1.3.12 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2

Strunz Class:

VIII/J.25-30 VIII - Silicates

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

VIII/J.25 - Zeolite group, Amicite - Phillipsite - Yugawaralite series

VIII/J.25-10 Amicite K2Na2Al4Si4O16·5(H2O) I2 2

VIII/J.25-20 Gismondine Ca2Al4Si4O16·9(H2O) P 2₁/c 2/m

VIII/J.25-30 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn2₁ mm2

VIII/J.25-40 Garronite Na2Ca5Al12Si20O64·27(H2O) I 4₁/a 4/m

VIII/J.25-50 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-55 Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-60 Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-70 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-75 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2

VIII/J.25-80 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m

VIII/J.25-90 Yugawaralite CaAl2Si6O16·4(H2O) Pc m

Other Gobbinsite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Gobbinsite

(Na2,Ca)2K2Al6Si10O32·12(H2O)
Dana No: 77.1.3.4 Strunz No: VIII/J.25-30
Locality:

Notes: