Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (3 online) Mindat Auctions

Harmotome

Big Photo

Bellsgrove Quarry (Strontian Barytes Mine; Middleshop mine), Strontian, North West Highlands (Argyllshire), Scotland, UK
© Steve Rust

Show Harmotome Photos (127)
Formula:
(Ba
 
0.5
,Ca
 
0.5
,K,Na)
 
5
[Al
 
5
Si
 
11
O
 
32
] ·12H
 
2
O
System:MonoclinicColour:Colorless, white, grey, ...
Hardness:4 - 5
Name:From the Greek for "joint" and "cutting," as the twin crystals


Zeolite Group. Harmotome-Phillipsite-Ca Series.

Classification of Harmotome

IMA status:Approved
Strunz 8th edition ID:8/J.25-70
Nickel-Strunz 10th (pending) edition ID:9.GC.10

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
C : Chains of doubly-connected 4-membered rings
Dana 8th edition ID:77.1.3.5

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
Hey's CIM Ref.:16.12.9

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn
mindat.org URL:http://www.mindat.org/min-1820.html
Please feel free to link to this page.

Type Occurrence of Harmotome

Type Locality:St Andreasberg, St Andreasberg District, Harz Mts, Lower Saxony, Germany
Year of Discovery:1801

Occurrences of Harmotome

Geological Setting:Cavities in basalts, phonolites, trachyites, gneisses and some hydrothermal veins.

Physical Properties of Harmotome

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless, white, grey, pink, yellow, brown
Streak:White
Hardness (Mohs):4 - 5
Tenacity:Brittle
Cleavage:Distinct/Good
Distinct on {010}, poor on {001}
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):2.41 - 2.47 g/cm3
Density (calculated):2.448 g/cm3

Crystallography of Harmotome

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m (P1 1 21/m) [P21/m] {P1 21/m 1}
Cell Parameters:a = 9.8688(21) Å, b = 14.1295(7) Å, c = 8.7092(9) Å
β = 124.74°
Ratio:a:b:c = 0.698 : 1 : 0.616
Unit Cell Volume:V 997.95 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals elongate or tabular, frequently twinned.
Twinning:Repeated on {001} {021} {110}
Structure
  Reference
Stuckenschmidt E Fuess H Kvick A (1990) Investigation of the structure of harmotome by X-ray (293 K, 100 K) and neutron diffraction (15 K) Sample: 293 K. European Journal of Mineralogy 2:861-874.

Show
Unit Cell | Structure | Polyhedra

Style
Black Background | White Background

Rotation
Stop | Start

Labels
Label Atoms | Off

More Crystal Structures
Click here to view more crystal structures at the American Mineralogist Crystal Structure Database

Optical Data of Harmotome

Type:Biaxial (+)
RI values: nα = 1.503 - 1.508 nβ = 1.505 - 1.509 nγ = 1.508 - 1.514
2V:Measured: 43° , Calculated: 80°
Maximum Birefringence:δ = 0.005 - 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak

Chemical Properties of Harmotome

Formula:
(Ba
 
0.5
,Ca
 
0.5
,K,Na)
 
5
[Al
 
5
Si
 
11
O
 
32
] ·12H
 
2
O
Essential elements:Al, Ba
All elements listed in formula:Al, Ba, Ca, H, K, Na, O, Si
Common Impurities:Na,Ca

Relationship of Harmotome to other Species

Series:Forms a series with Phillipsite-Ca (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
9.GC.05Amicite
K
 
2
Na
 
2
Al
 
4
Si
 
4
O
 
16
·5H
 
2
O
9.GC.05Garronite
Na
 
2
Ca
 
5
Al
 
12
Si
 
20
O
 
64
·27H
 
2
O
9.GC.05Gismondine-Ca
CaAl
 
2
Si
 
2
O
 
8
·4H
 
2
O
9.GC.05Gobbinsite
Na
 
4
(Ca,Mg,K
 
2
)Al
 
6
Si
 
10
O
 
32
·12H
 
2
O
9.GC.05Gismondine
Ca[Al
 
2
Si
 
2
O
 
8
]·4.5H
 
2
O
9.GC.10Phillipsite-Ca
(Ca
 
0.5
,K,Na,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
.
 
 12H2O
9.GC.10Phillipsite-K
(K,Na,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
]
.
 
 12H
 
2
O
9.GC.10Phillipsite-Na
(Na,K,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
] · 12H
 
2
O
9.GC.15Merlinoite
(K,Na)
 
5
(Ca,Ba)
 
2
Al
 
9
Si
 
23
O
 
64
·23H
 
2
O
9.GC.20Mazzite-Mg
K
 
2
Mg
 
2
Ca
 
1.5
Al
 
9.5
Si
 
26.5
O
 
72
·28H
 
2
O or near
9.GC.20Mazzite-Na
Na
 
4
[Al
 
4
Si
 
14
O
 
36
]
 
2
 · 30H
 
2
O
9.GC.25Perlialite
K
 
9
Na(Ca,Sr)[Al
 
2
Si
 
4
O
 
12
]
 
6
 · 15H
 
2
O
9.GC.30Boggsite
Ca
 
8
Na
 
3
(Si,Al)
 
96
O
 
192
·70H
 
2
O
9.GC.35Paulingite-Ca
(Ca,K
 
2
,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
9.GC.35Paulingite-K
(K
 
2
,Ca,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
16.12.1Stronalsite
SrNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
16.12.2Slawsonite
(Sr,Ca)[Al
 
2
Si
 
2
O
 
8
]
16.12.3Brewsterite
16.12.4Celsian
Ba[Al
 
2
Si
 
2
O
 
8
]
16.12.5Paracelsian
Ba[Al
 
2
Si
 
2
O
 
8
]
16.12.6Cymrite
BaAl
 
2
Si
 
2
(O,OH)
 
8
·H
 
2
O
16.12.7Edingtonite
Ba[Al
 
2
Si
 
3
O
 
10
] · 4H
 
2
O
16.12.8Banalsite
BaNa
 
2
[Al
 
2
Si
 
2
O
 
8
]
 
2
16.12.10Hyalophane
(K,Ba)[Al(Si,Al)Si
 
2
O
 
8
]
16.12.11Balipholite
BaLiMg
 
2
Al
 
3
[(OH)
 
4
|Si
 
2
O
 
6
]
 
2
16.12.12Armenite
BaCa
 
2
Al
 
6
Si
 
9
O
 
30
·2H
 
2
O
16.12.13Wellsite
(Ba,Ca,K
 
2
)Al
 
2
Si
 
6
O
 
16
·6H
 
2
O
16.12.14Merlinoite
(K,Na)
 
5
(Ca,Ba)
 
2
Al
 
9
Si
 
23
O
 
64
·23H
 
2
O
16.12.15Anandite
(Ba,K)(Fe
2+
 
,Mg)
 
3
[(O,OH)
 
2
|(Si,Al,Fe)
 
4
O
 
10
]
16.12.16Fraipontite
(Zn,Al)
 
3
[(OH)
 
4
|(Si,Al)
 
2
O
 
5
]
16.12.17Sauconite
Na
 
0.3
Zn
 
3
(Si,Al)
 
4
O
 
10
(OH)
 
2
·4H
 
2
O
16.12.18Minehillite
(K,Na)
 
2-3
Ca
 
28
Zn
 
4
Al
 
4
Si
 
40
O
 
112
(OH)
 
16
16.12.19Hendricksite
K(Zn,Mg,Mn
2+
 
)
 
3
[(OH)
 
2
|AlSi
 
3
O
 
10
]
16.12.20Baileychlore
(Zn,Fe,Al,Mg)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8

Other Names for Harmotome

Synonyms:
AndreoliteAndréolitheBarytes HarmotomeErcinite
Other Languages:
Dutch:Harmotoom
French:Andréasbergolite
German:Harmotom
Andreolit
Ercinit
Italian:Armotomo
Polish:Harmotom
Russian:Гармотом
Spanish:Andréasbergolita
Andreolita
Ercinita
Ukrainian:Гармотом
Varieties:
Morvenite

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Harmotome

Reference List:Klaproth, M.H. (1797): Untersuchung des Kreuzsteins vom Harz, Beiträge zur chemischen Kenntniss der Mineralkörper, Zweiter Band, Rottmann Berlin, 80-83

Acta Crystallographica: B30: 2426-2433.

Internet Links for Harmotome

Search Engines:
  • Look for Harmotome on Google
  • Look for Harmotome images on Google
    • External Links:
  • Look for Harmotome on Webmineral
  • Look for Harmotome on Athena Mineralogy
  • Look for Harmotome on Wikipedia
  • Look for Harmotome on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Harmotome in the Natural History Museum (London) online catalogue
  • Harmotome details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Top quality minerals from Kristalle of California
  • Fabre Minerals - search for Harmotome specimens
  • Buy from David K Joyce minerals
  • SpiriferMinerals.com - high quality specimens
  • Find Harmotome on www.crystalclassics.co.uk
  • Search for Harmotome on minvision.com
  • High-end worldwide specimens & outstanding customer service
  • Wilensky Fine Minerals
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Buy fine minerals and gemstones from Pala International
  • The Arkenstone - Fine Minerals
  • Wendel Minerals - Auktion & Shop
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Harmotome

    Show Locality List (221 Items)
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    These maps work faster with Firefox!
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register.