Reyerite Mineral Data

Reyerite Mineral Data +

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.

Synonym:

ICSD 68171

PDF 29-1039

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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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Reyerite

Electron Density:

r_electron=2.57 gm/cc
note: r_Reyerite=2.56 gm/cc.

Fermion Index

Fermion Index = 0.012
Boson Index = 0.988

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)

Estimated Radioactivity from Reyerite - barely detectable

Reyerite Classification

Dana Class:

73.2.2a.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.2)with double and single layers

(73.2.2a)Reyerite group (Reyerite Subgroup)

73.2.2a.1 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3

73.2.2a.2 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig

Strunz Class:

VIII/H.34-30 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 Reyerite Information

References:

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

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Reyerite

(Na,K)4Ca14Si22Al2O58(OH)8·6(H2O)
Dana No: 73.2.2a.1 Strunz No: VIII/H.34-30
Locality:

Notes: