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Gyrolite Mineral Data

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General Gyrolite Information

Help on Chemical  Formula: Chemical Formula: NaCa16Si23AlO60(OH)8•64(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaCa16Si23AlO60(OH)8•64(H2O)
Help on Environment: Environment: Secondary mineral from the alteration of basalts. Pegmatite dike intruding limestone.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1851
Help on Locality: Locality: Isle of Skye, Scotland, UK. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek guros = "circle", in allusion to the round form of the crystalline groupings.
Help on Name Pronunciation: Name Pronunciation: Gyrolite Say GYROLITE
Help on Synonym: Synonym: Centrallasite
  ICSD 68199
  PDF 42-1452

Gyrolite Image

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

Gyrolite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:13.66255
Help on Cell Dimensions: Cell Dimensions: a = 9.72, c = 132.8, Z = 5; V = 10,865.79 Den(Calc)= 2.74
Help on Crystal System: Crystal System: Hexagonal - Pyramidal H-M Symbol (6) Space Group: P 61
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.12(1), 22(1), 11(0.8),

Physical Properties of Gyrolite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Brown, Colorless, Yellow, White, Light green.
Help on Density: Density: 2.45 - 2.51, Average = 2.48
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Compact - Occurs as a compact mass.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Fluorescent, Short UV=white, Long UV=white.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Gyrolite

Help on Gladstone-Dale: 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
Ncalc = 1.62 - 1.69
Help on Optical Data: Optical Data: Biaxial (-), a=1.535, b=1.548, g=1.549, bire=0.0140

Calculated Properties of Gyrolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Gyrolite =2.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0089417003
Boson Index = 0.9910582997
Help on Photoelectric: Photoelectric: PEGyrolite = 2.94 barns/electron
U=PEGyrolite x rElectron Density= 7.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gyrolite is Not Radioactive

Gyrolite Classification

Help on  Dana Class: Dana Class: 73.02.02c.01 (73)Phyllosilicate Condensed Tetrahedral Sheets
  (73.02)with double and single layers
  (73.02.02c)Reyerite group (Gyrolite Subgroup)
73.02.02c.01 Gyrolite NaCa16Si23AlO60(OH)8•64(H2O) P 61 6
Help on  Strunz Class: Strunz Class: 09.EE.30 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.30 Gyrolite NaCa16Si23AlO60(OH)8•64(H2O) P 61 6
09.EE.30 Tungusite [Ca14(OH)8](Si8020)(Si8020)2[Fe9(OH)14] P1 1

Other Gyrolite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Gyrolite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: 73.02.02c.01 Strunz No: 09.EE.30





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