Harmotome Mineral Data

Harmotome Mineral Data +

General Harmotome Information

Chemical Formula:

(Ba,Na,K)1-2(Si,Al)8O16·6(H2O)

Composition:

Molecular Weight = 704.93 gm

Potassium 0.55 % K 0.67 % K₂O

Barium 15.58 % Ba 17.40 % BaO

Sodium 0.65 % Na 0.88 % Na₂O

Aluminum 7.66 % Al 14.46 % Al₂O₃

Silicon 23.91 % Si 51.14 % SiO₂

Hydrogen 1.72 % H 15.33 % H₂O

Oxygen 49.93 % O

______ ______

100.00 % 99.89 % = TOTAL OXIDE

Empirical Formula:

Ba_0.8Na_0.2K_0.1Al₂Si₆O₁₆·6(H₂O)

Environment:

Alteration product of basalt and similar eruptive rocks.

IMA Status:

Valid Species (Pre-IMA) 1801

Locality:

Bodenmais in Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek harmos - "I combine" and temseis - "I cut" alluding to the fact that the pyramid divides parallel to the plane that passes through the terminal edges.

Synonym:

Andreasbergolite

Andreolite

Barytkreuzstein

ICSD 15460

Kurtzite

PDF 39-1377

Wellsite-calcian Harmotome

Harmotome Image

Images:

Harmotome

Comments: Root beer colored calcite covered with harmotome crystals from 1 mm to 1 cm.
Location: Strontian Hills, Strontian, Argyll, Scotland. Scale: 5.5 x 4.5 cm.
© John Veevaert

Harmotome Crystallography

Axial Ratios:

a:b:c =0.6987:1:0.6148

Cell Dimensions:

a = 9.879, b = 14.139, c = 8.693, Z = 2; beta = 55.166° V = 996.65 Den(Calc)= 2.35

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 2.67(1), 2.7(1), 3.12(1),

Physical Properties of Harmotome

Cleavage:

[010] Good, [001] Fair

Color:

White, Gray, Yellow, Red, Brown.

Density:

2.44 - 2.5, Average = 2.46

Diaphaniety:

Subtransparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Cruciform - Twinned tabular crystals with a cross-like outline.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Harmotome

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.215,KPDmeas= 0.2046,KC= 0.2137

Optical Data:

Biaxial (+), a=1.503, b=1.505, g=1.508, bire=0.0050, 2V(Calc)=80, 2V(Meas)=43. Dispersion none.

Calculated Properties of Harmotome

Electron Density:

r_electron=2.31 gm/cc
note: r_Harmotome=2.35 gm/cc.

Fermion Index

Fermion Index = 0.03918
Boson Index = 0.96082

Photoelectric:

PE_Harmotome= 64.75 barns/electron
U=PE_Harmotome x r_electron= 149.76 barns/cc.

Radioactivity:

GRapi = 7.87 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Harmotome - barely detectable

Harmotome Classification

Dana Class:

77.1.3.5 (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.25-70 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 Harmotome Information

References:

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

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Harmotome

(Ba,Na,K)1-2(Si,Al)8O16·6(H2O)
Dana No: 77.1.3.5 Strunz No: VIII/J.25-70
Locality:

Notes: