Gyrolite Mineral Data

Gyrolite Mineral Data +

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General Gyrolite Information

Chemical Formula:

NaCa16Si23AlO60(OH)8·64(H2O)

Composition:

Molecular Weight = 3,586.19 gm

Sodium 0.64 % Na 0.86 % Na₂O

Calcium 17.88 % Ca 25.02 % CaO

Aluminum 0.75 % Al 1.42 % Al₂O₃

Silicon 18.01 % Si 38.54 % SiO₂

Hydrogen 3.82 % H 34.16 % H₂O

Oxygen 58.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaCa₁₆Si₂₃AlO₆₀(OH)₈·64(H₂O)

Environment:

Secondary mineral from the alteration of basalts. Pegmatite dike intruding limestone.

IMA Status:

Valid Species (Pre-IMA) 1851

Locality:

Isle of Skye, Scotland, UK. Link to MinDat.org Location Data.

Name Origin:

From the Greek guros = "circle", in allusion to the round form of the crystalline groupings.

Synonym:

Centrallasite

ICSD 68199

PDF 42-1452

Gyrolite Image

Images:

Gyrolite

Comments: Two round beige gyrolite aggregates each about 5cm diameter.
Location: Bombay, India. Scale: Specimen size 10cm.
© John Attard

Gyrolite Crystallography

Axial Ratios:

a:c = 1:13.66255

Cell Dimensions:

a = 9.72, c = 132.8, Z = 5; V = 10,865.79 Den(Calc)= 2.74

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₁

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

By Intensity(I/I_o): 3.12(1), 22(1), 11(0.8),

Crystal Structure:

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Merlino S , Mineralogical Magazine , 52 (1988) p.377-387, Gyrolite: its crystal structure and crystal chemistry, Locality: Qarusait, Greenland, Note: x-coordinate of O102 adjusted to match reported bond lengths, Note: occupancies invented to match formula, Locality: Qarusait, Greenland

Physical Properties of Gyrolite

Cleavage:

[???] Perfect

Color:

Brown, Colorless, Yellow, White, Light green.

Density:

2.45 - 2.51, Average = 2.48

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Compact - Occurs as a compact mass.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Gyrolite

Gladstone-Dale:

CI meas= 0.134 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.217 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1985,KPDmeas= 0.2194,KC= 0.2534

Optical Data:

Biaxial (-), a=1.535, b=1.548, g=1.549, bire=0.0140

Calculated Properties of Gyrolite

Electron Density:

r_electron=2.57 gm/cc
note: r_Gyrolite=2.48 gm/cc.

Fermion Index

Fermion Index = 0.00894
Boson Index = 0.99106

Photoelectric:

PE_Gyrolite= 2.94 barns/electron
U=PE_Gyrolite x r_electron= 7.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gyrolite is Not Radioactive

Gyrolite Classification

Dana Class:

73.2.2c.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.2)with double and single layers

(73.2.2c)Reyerite group (Gyrolite Subgroup)

73.2.2c.1 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 6₁ 6

Strunz Class:

VIII/H.34-40 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.34 - Gyrolite series

VIII/H.34-10 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

VIII/H.34-20 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig

VIII/H.34-25 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

VIII/H.34-28 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1

VIII/H.34-30 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3

VIII/H.34-40 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 6₁ 6

VIII/H.34-45 Tungusite Ca14(OH)8(Si8O20)3Fe9(OH)14 P1 1

VIII/H.34-50 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3

VIII/H.34-70 Armstrongite CaZrSi6O15·3(H2O) C 2 2

Other Gyrolite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Gyrolite

NaCa16Si23AlO60(OH)8·64(H2O)
Dana No: 73.2.2c.1 Strunz No: VIII/H.34-40
Locality:

Notes: