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|Name:||Named by Stewart Olof Agrell, Michael G. Bown, and Duncan McKie in 1964 in honour of Prof. Robert Andrew Howie (1923 - March 10, 2012 Derby, England, UK), British petrologist and mineralogist of King's College, London University, United Kingdom. Prof. Howie was one of the authors of the Rock-Forming Minerals book series (Deer, Howie and Zussman).|
This page provides mineralogical data about Howieite.
Classification of Howieite
|IMA status:||Approved 1964|
|Strunz 8th edition ID:||8/F.16-20|
|Nickel-Strunz 10th (pending) edition ID:||9.DH.65|
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
|Dana 8th edition ID:||220.127.116.11|
69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
|Hey's CIM Ref.:||16.16.13|
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
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Type Occurrence of Howieite
|Type Locality:||Laytonville Quarry ("Longvale"; "Longvale Quarry"), Laytonville, Coastal Range, Mendocino Co., California, USA|
|Year of Discovery:||1964|
Occurrences of Howieite
|Geological Setting:||Iron-rich metasediments from the blueschist facies of metamorphism.|
Crystallography of Howieite
|Cell Parameters:||a = 10.17Å, b = 9.72Å, c = 9.56Å|
α = 91.3°, β = 70.7°, γ = 109°
|Ratio:||a:b:c = 1.046 : 1 : 0.984|
|Unit Cell Volume:||V 839.50 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Optical Data of Howieite
|RI values:||nα = 1.701 nβ = 1.720 nγ = 1.734|
|2V:||Measured: 65° , Calculated: 80°|
|Maximum Birefringence:||δ = 0.033|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Howieite
|Essential elements:||Fe, H, Na, O, Si|
|All elements listed in formula:||Al, Fe, H, Mn, Na, O, Si|
Relationship of Howieite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Howieite
|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 Howieite
Agrell, S.O. (1964), Deerite, howieite, and zussmanite, three new minerals from the Franciscan of the Laytonville district, Mendocino County, California (title only): American Mineralogist: 49.
Agrell, S.O., M.G. Bown & McKie (1965), Deerite, howieite and zussmanite, three new minerals from the Franciscan of the Laytonville district, Mendocino County, California: American Mineralogist: 50: 278.
Boerner, U. (1969), Deerit, Howieit und Zussmanit, neue seltene Mineralien von einen Steinbruch bei Laytonville in Nord-Kalifornien: Aufschluss: 20: 338-341.
Wenk, H.R. (1974) Howieite, a new type of chain silicate. American Mineralogist: 59: 86-97.
Internet Links for Howieite
Localities for Howieite
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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.