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 % K2 O
Barium 15.58 % Ba 17.40 % BaO
Sodium 0.65 % Na 0.88 % Na2 O
Aluminum 7.66 % Al 14.46 % Al2 O3
Silicon 23.91 % Si 51.14 % SiO2
Hydrogen 1.72 % H 15.33 % H2 O
Oxygen 49.93 % O
______ ______
100.00 % 99.89 % = TOTAL OXIDE
Empirical Formula:
Ba0.8 Na0.2 K0.1 Al2 Si6 O16 •6(H2 O)
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.
Name Pronunciation:
Harmotome + Pronunciation
Synonym:
Andreasbergolite
Andreolite
Barytkreuzstein
ICSD 15460
Kurtzite
PDF 39-1377
Wellsite - Ca bearing
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /m
X Ray Diffraction:
By Intensity(I/Io ): 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
Diaphaneity:
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:
Non-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 Ncalc = 1.5 - 1.53
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:
Bulk Density (Electron Density)=2.31 gm/cc note: Specific Gravity of Harmotome =2.35 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEHarmotome = 64.75 barns/electronU=PEHarmotome x r electron = 149.76 barns/cc.
Radioactivity:
GRapi = 7.87 (Gamma Ray American Petroleum Institute Units)
Concentration of Harmotome per GRapi unit = 12.70 (%)
Estimated Radioactivity from Harmotome - barely detectable
Harmotome Classification
Dana Class:
77.01.03.05 (77) Tectosilicate Zeolite group
(77.01) true zeolites
(77.01.03) Gismondine and related species
77.01.03.01 Gismondine Ca2Al4Si4O16•9(H2O) P 21 /c 2/m
77.01.03.02 Amicite K2Na2Al4Si4O16•5(H2O) I2 2
77.01.03.03 Garronite Na2Ca5Al12Si20O64•27(H2O) I 41 /a 4/m
77.01.03.04 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn21 mm2
77.01.03.05 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.06 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.06a Phillipsite-Ca ! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.06b Phillipsite-K ! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.08 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m
77.01.03.09 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90•45(H2O) Im3 m 4/m 3 2/m
77.01.03.09a Paulingite-Na ! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3 m 4/m 3 2/m
77.01.03.09b Paulingite-Ca ! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3 m 4/m 3 2/m
77.01.03.10 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.03.10a Mazzite-Na ! Na8Al8Si28O72•30H2O P 63 /mmc 6/m 2/m 2/m
77.01.03.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64•23(H2O) I mmm 2/m 2/m 2/m
77.01.03.12 Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2
Strunz Class:
09.GC.10 09 - SILICATES (Germanates)
09.G - Tektosilicates with Zeolitic H2O
09.GC -Chains of doubly-connected 4-membered rings
09.GC.10 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
09.GC.10 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
09.GC.10 Phillipsite-Ca ! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
09.GC.10 Phillipsite-K ! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
Other Harmotome Information
References:
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Harmotome :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST
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Harmotome
(Ba,Na,K)1-2(Si,Al)8O16•6(H2O)
Dana No: 77.01.03.05 Strunz No: 09.GC.10
Locality:
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