Reyerite Mineral Data

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General Reyerite Information

Chemical Formula:

(Na,K)4Ca14Si22Al2O58(OH)8•6(H2O)

Composition:

Molecular Weight = 2,513.12 gm

Potassium 1.56 % K 1.87 % K₂O

Sodium 2.74 % Na 3.70 % Na₂O

Calcium 22.33 % Ca 31.24 % CaO

Aluminum 2.15 % Al 4.06 % Al₂O₃

Silicon 24.59 % Si 52.60 % SiO₂

Hydrogen 0.80 % H 7.17 % H₂O

Oxygen 45.84 % O

______ ______

100.00 % 100.64 % = TOTAL OXIDE

Empirical Formula:

Na₃KCa₁₄Si₂₂Al₂O₅₈(OH)₈•6(H₂O)

Environment:

In cavities in basalt and basic tuffs.

IMA Status:

Valid Species (Pre-IMA) 1907

Locality:

Niaqornat, Nuussuaq, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Eduard Reyer (1849-1907), Austrian geologist.

Name Pronunciation:

Reyerite

Synonym:

ICSD 68171

PDF 29-1039

Reyerite Image

Images:

Reyerite

Comments: Micaceous white plates of reyerite in cavity in basalt.
Location: Drynoch near Carbost, Isle of Skye, Scotland. Scale: Specimen Size 1.5x2 cm.
© Diederik Visser

Reyerite Crystallography

Axial Ratios:

a:c = 1:1.95309

Cell Dimensions:

a = 9.764, c = 19.07, Z = 1; V = 1,574.48 Den(Calc)= 2.65

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3

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

By Intensity(I/I_o): 3.17(1), 2.659(0.8), 2.855(0.8),

Crystal Structure:

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Merlino S , Mineralogical Magazine , 52 (1988) p.247-256, The structure of reyerite, (Na,K)2Ca14Si22Al2O58(OH)8*6H2O, Locality: Niakornak, Greenland, Note: anisoU s from ICSD

Physical Properties of Reyerite

Cleavage:

{0001} Perfect

Color:

Colorless, White, Light green.

Density:

2.54 - 2.578, Average = 2.55

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Reyerite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2113,KPDmeas= 0.2188,KC= 0.2185
Ncalc = 1.55 - 1.58

Optical Data:

Uniaxial (-), e=1.558-1.563, w=1.5558-1.563, bire=0.0000-0.0022.

Calculated Properties of Reyerite

Electron Density:

Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Reyerite =2.56 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Reyerite= 3.94 barns/electron
U=PE_Reyerite x r_electron= 10.12 barns/cc.

Radioactivity:

GRapi = 22.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Reyerite per GRapi unit = 4.44 (%)

Estimated Radioactivity from Reyerite - barely detectable

Reyerite Classification

Dana Class:

73.02.02a.01 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.02)with double and single layers

(73.02.02a)Reyerite group (Reyerite Subgroup)

73.02.02a.01 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8•6(H2O) P 3 3

73.02.02a.02 Truscottite (Ca,Mn)14Si24O58(OH)8•2(H2O) p3 or p3 Trig

Strunz Class:

09.EE.35 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.35 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8•6(H2O) P 3 3

09.EE.35 Truscottite (Ca,Mn)14Si24O58(OH)8•2(H2O) p3 or p3 Trig

Other Reyerite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Reyerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Reyerite Specimen Label here :

Reyerite

(Na,K)4Ca14Si22Al2O58(OH)8•6(H2O)
Dana No: 73.02.02a.01 Strunz No: 09.EE.35
Locality:

Notes: