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| Rossmanite
is named
after George R. Rossman (1944
- ), California Institute of
Technology, Pasadena, California, USA, in recognition for his work on
the spectroscopy of the tourmaline-group minerals (and many other
mineral species).
| Discovered
in 1996; IMA
status:
Valid (IMA Approved 1998) |
|
Chemistry
|
|
|
Chemical
Formula: |
[](LiAl2)Al6(Si6O18)(BO3)3(OH)4
|
|
Vacancy-dominant
Lithium
Aluminum Boro-Silicate Hydroxide |
Molecular
Weight: |
923.75 gm
|
Composition: |
Lithium |
0.75 % |
Li |
1.62 % |
Li2O |
|
Aluminum |
23.37 % |
Al |
44.15 % |
Al2O3 |
|
Silicon |
18.24 % |
Si |
39.03 % |
SiO2 |
|
Boron |
3.51 % |
B |
11.30 % |
B2O3 |
|
Hydrogen |
0.44 % |
H |
3.90 % |
H2O |
|
Oxygen |
53.69 % |
O |
|
|
|
|
100.00 % |
|
100.00 % |
= TOTAL OXIDE |
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Classification
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|
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Mineral
Classification: |
Silicates
|
Strunz 8th
Ed. ID:
|
8/E.19-05
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Nickel-Strunz 10th
Ed. ID:
|
9.CK.05
|
|
9 : SILICATES (Germanates)
C : Cyclosilicates K : [Si6O18]12- 6-membered single rings, with insular complex anions
|
Related
to: |
Tourmaline
Group.
|
Members
of Group: |
Tourmaline
Group: Adachiite,
Buergerite, Chromium-dravite,
Chromo-alumino-povondraite, Darrellhenryite, Dravite,
Elbaite, Feruvite, Fluor-buergerite, Fluor-dravite,
Fluor-elbaite, Fluor-feruvite, Fluor-liddicoatite, Fluor-schorl,
Fluor-tsilaisite, Fluor-uvite, Foitite, ICSD 85557,
IMA1996-018, Liddicoatite,
Luinaite-(OH), Magnesio-foitite, Maruyamaite, Olenite,
Oxy-chromium-dravite, Oxy-dravite, Oxy-rossmanite, Oxy-schorl,
Oxy-vanadium-dravite, PDF(76-1951), Povondraite, Rossmanite, Schorl,
Tsilaisite, UM2000-64-SiO:BFeHKMg, Unnamed (Pb-dominant Tourmaline),
Uvite, Vanadio-oxy-chromium-dravite, Vanadio-oxy-dravite,
Vanadiumdravite
|
Varieties: |
None
|
Synonyms: |
None
|
|
|
Crystal
Data
|
|
|
Crystallography:
|
Trigonal - Ditrigonal Pyramidal
|
Crystal
Habit:
|
Euhedral
columnar crystals about 25 mm long and 5 mm thick, elongated
along the c axis with striations parallel to c on the
prism faces.
|
Twinning:
|
None
|
|
|
Physical
Properties
|
|
|
Cleavage: |
None
|
Fracture: |
n/a
|
Tenacity:
|
Brittle
|
Moh's
Hardness: |
7.0
|
Density:
|
3.00
- 3.06 (g/cm3)
|
Luminescence:
|
None
|
Radioactivity:
|
Not
Radioactive
|
|
|
Optical
Properties
|
|
|
Color: |
Pink,
pale-pink to colorless;
colorless in thin slivers and in transmitted light
|
Transparency: |
Opaque
|
Luster: |
Vitreous
|
Refractive
Index: |
1.624
- 1.645 Uniaxial ( - )
|
Birefringence: |
0.021
|
Dispersion: |
n/a |
Pleochroism: |
n/a |
|
|
Occurances
|
|
|
Geological
Setting: |
Lepidolite
subtype pegmatite along the contact with a mica-schist
zone |
Common
Associations: |
Albite,
Amblygonite-montebrasite, Apatite, Beryl, Biotite, Cassiterite,
Elbaite, Lepidolite, Manganocolumbite, Schorl, Topaz |
Common
Impurities: |
n/a
|
Type
Locality: |
Rožná pegmatite (Rozna; Roschna), Žďár nad Sázavou, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic
|
Year
Discovered: |
1996
|
View
mineral photos: |
Rossmanite
Mineral Photos and Locations |
|
|
More
Information
|
|
|
|
Mindat.org
Webmineral.com
|
|
|
Rossmanite
is a relatively new Tourmaline
species that was
discovered in 1996 near Rožná,
western Moravia, Czech Republic. It
is named
after George R. Rossman (1944
- ), California Institute of
Technology, Pasadena, California, USA, in recognition for his work on
the spectroscopy of the tourmaline-group minerals and many other
mineral species. Rossmanite
forms pink euhedral
columnar crystals about 25 mm
long and 5 mm thick. It is indistinguishable from the Rubellite
variety of Elbaite that it often occurs with and requires
identification by quantitative chemical analysis. One of the proven
finds of Rossmanite occurs at the Tanco
Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada.
The cabochon pictured above is from the Tanco Mine.
Locations
for Rossmanite: the type locality at Rožná pegmatite (Rozna; Roschna), Žďár nad Sázavou, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic.
In Canada at the Tanco
Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba. In
Italy at the Grotta d'Oggi Quarry, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany.
In the UK at the Dorothy China Clay Pit, Whitemoor, St Stephen-in-Brannel, St Austell District, Cornwall, England.
Other minor localities also exist including in China, Germany, the Republic of Congo,
Russia, Sweden, Tanzania, the United States,
Vietnam, Madagascar, Mozambique, Namibia and Nigeria.
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