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Merwinite

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Herbert Eugene Merwin
Formula:
Ca3Mg(SiO4)2
System:
Monoclinic
Colour:
White, colorless, light ...
Lustre:
Vitreous, Sub-Vitreous, Greasy
Hardness:
6
Name:
Named in 1921 by Esper S. Larsen I and George Faust for Herbert Eugene Merwin [1878-1963], mineralogist Carnegie Institute, Washington, DC.
This page provides mineralogical data about Merwinite.


Classification of Merwinite

Approved, 'Grandfathered' (first described prior to 1959)
9.AD.15

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
51.4.2.1

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
14.6.11

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both

Physical Properties of Merwinite

Vitreous, Sub-Vitreous, Greasy
Diaphaneity (Transparency):
Transparent
Colour:
White, colorless, light green, light gray green
Streak:
White
Hardness (Mohs):
6
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Distinct/Good
{100}
Fracture:
Irregular/Uneven
Density:
3.15 - 3.32 g/cm3 (Measured)    3.32 g/cm3 (Calculated)

Optical Data of Merwinite

Type:
Biaxial (+)
RI values:
nα = 1.706 - 1.708 nβ = 1.711 - 1.712 nγ = 1.718 - 1.724
2V:
Measured: 65° to 74°, Calculated: 62° to 82°
Birefringence:
0.014
Max Birefringence:
δ = 0.012 - 0.016
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Pleochroism:
Non-pleochroic

Chemical Properties of Merwinite

Formula:
Ca3Mg(SiO4)2
Elements listed in formula:
Common Impurities:
Al,Fe

Crystallography of Merwinite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 13.29 Å, b = 5.3 Å, c = 9.35 Å
β = 92.09°
Ratio:
a:b:c = 2.508 : 1 : 1.764
Unit Cell Volume:
V 658.15 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Polysynthetic {100}
Comment:
Distorted glaserite structure, not an olivine.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.70 (50)
2.752 (40)
2.674 (100)
2.652 (50)
2.452 (80)
2.211 (40)
2.031 (30)
1.909 (30)
Comments:
Natural material, also 35-591 (synthetic)

Type Occurrence of Merwinite

Geological Setting of Type Material:
High temperature, low pressure contact metamorphic zones with marbles.

Relationship of Merwinite to other Species

9.AD.05LarniteCa2SiO4
9.AD.10Calcio-olivineCa2SiO4
9.AD.20Bredigite(Ca,Ba)Ca13Mg2(SiO4)8
9.AD.25AndraditeCa3Fe23+(SiO4)3
9.AD.25AlmandineFe32+Al2(SiO4)3
9.AD.25CalderiteMn32+Fe23+(SiO4)3
9.AD.25GoldmaniteCa3V23+(SiO4)3
9.AD.25GrossularCa3Al2(SiO4)3
9.AD.25HenritermieriteCa3Mn23+(SiO4)2(OH)4
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25HydroandraditeCa3Fe23+(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(OH)12
9.AD.25KimzeyiteCa3Zr2(Al2Si)O12
9.AD.25KnorringiteMg3Cr2(SiO4)3
9.AD.25MajoriteMg3(MgSi)(SiO4)3
9.AD.25MorimotoiteCa3TiFe2+Si3O12
9.AD.25PyropeMg3Al2(SiO4)3
9.AD.25SchorlomiteCa3Ti2(Fe23+Si)O12
9.AD.25SpessartineMn32+Al2(SiO4)3
9.AD.25UvaroviteCa3Cr2(SiO4)3
9.AD.25WadaliteCa6Al5Si2O16Cl3
9.AD.25HoltstamiteCa3Al2(SiO4)2(OH)4
9.AD.25KerimasiteCa3Zr2(Fe23+Si)O12
9.AD.25ToturiteCa3Sn2(Fe23+Si)O12
9.AD.25MomoiiteMn32+V23+(SiO4)3
9.AD.25EltyubyuiteCa12Fe103+Si4O32Cl6
9.AD.25HutcheoniteCa3Ti2(Al2Si)O12
9.AD.30CoffiniteU[SiO4,(OH)4]
9.AD.30HafnonHfSiO4
9.AD.30ThoriteThSiO4
9.AD.30ZirconZrSiO4
9.AD.30Stetindite-(Ce)CeSiO4
9.AD.35HuttoniteThSiO4
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2x
9.AD.40EulytineBi4(SiO4)3
9.AD.45ReiditeZrSiO4
14.6.1CombeiteNa2Ca2Si3O9
14.6.2PectoliteNaCa2Si3O8(OH)
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteKCa2Si3O8F
14.6.5TokkoiteK2Ca4Si7O18(OH)F
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2O
14.6.7RhodesiteK2Ca2Si8O19 · 5H2O
14.6.8MiseriteKCa6Si8O22(OH)
14.6.9ÅkermaniteCa2MgSi2O7
14.6.10MonticelliteCaMgSiO4
14.6.12DiopsideCaMgSi2O6
14.6.13Tremolite◻Ca2Mg5Si8O22(OH)2

Other Names for Merwinite

Name in Other Languages:
German:Merwinit
Simplified Chinese:镁硅钙石
镁蔷薇辉石
Spanish:Merwinita

Other Information

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

Merwinite in petrology

Common component of (items highlighted in red)

References for Merwinite

Reference List:
Larsen, E.S. & W.F. Foshag (1921), Merwinite, a new calcium magnesium orthosilicate from Crestmore, California, American Mineralogist: 6: 143-148.

Neuvonen, Kalle J. (1952), Heat of formation of Merwinite and monticellite: American Journal of Science, Bowen volume: 373-380.

Moore, Paulus B. & T. Araki (1972b) Atomic arrangement of Merwinite, Ca3Mg(SiO4)2, an unusual dense-packed structure of geophysical interest American Mineralogist: 57: 1355-1374.

Nawaz, R. and Preston, J. (1974) Optical orientation and twinning of merwinite: a restudy. American Mineralogist: 59: 1117-1120.

Internet Links for Merwinite

mindat.org URL:
https://www.mindat.org/min-2656.html
Please feel free to link to this page.

Localities for Merwinite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Brazil
 
  • Mato Grosso
    • Juína
D. A. Zedgenizov, A. Shatskiy, A. L. Ragozin, H. Kagi and V. S. Shatsky (2014): Merwinite in diamond from São Luiz, Brazil: A new mineral of the Ca-rich mantle environment. American Mineralogist 99, 547-550.
Bulgaria
 
  • Yambol Oblast
    • Bolyarovo Obshtina
I. Kostov, V. Breskovska, J. Mincheva-Stefanova, G. Kirov (1964): Minerals of Bulgaria. Sofia, Bulgaria, 540 pp. (in Bulgarian).
Canada
 
  • Nova Scotia
    • Inverness Co.
A.K. Chatterjee, "Mineralization and associated wall rock alteration in the George River Group, Cape Breton Island, Nova Scotia", Ph.D. thesis, Dalhousie University, Halifax, Nova Scotia, 197 p., 1980.
  • Québec
    • Nord-du-Québec
      • Kativik
Daniel F. Rosa and Robert F. Martin (2010) A spurrite-, merwinite- and srebrodolskite-bearing skarn assemblage, West Clearwater Lake impact crater, northern Quebec. The Canadian Mineralogist (December 2010), 48(6):1519-1532
China
 
  • Hebei Province
    • Baoding Prefecture
      • Laiyuan Co.
Xiangzhen Meng and Meifang Zhao (1985): Acta Petrological Sinica 1(3), 82-86
  • Hunan Province
    • Yiyang Prefecture
      • Anhua Co.
Shouquan Zhu (1994): Geology and Prospecting 30(6), 15-18
Germany
 
  • Lower Saxony
    • Osnabrück
      • Georgsmarienhütte
Schnorrer, G., Stahlmann, W., Mollenkamp, A. (2001): Sekundärmineralisation in den Hochofenschlacken des Hüttenwerkes in Georgsmarienhütte, heutige Georgsmarienhütte GmbH. Aufschluss 52, 99-108.
Israel
 
  • Negev
Sharygin, V.V., Sokol, E.V. & Vapnik, Ye. (2008): Minerals of the pseudobinary perovskite-brownmillerite series from combustion metamorphic larnite rocks of the Hatrurim Formation (Israel). Russian Geology and Geophysics 49, 709-726.
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Jordan
 
  • Amman
Pitty, A. F., & Alexander, W. R. (2010). A natural analogue study of cement buffered, hyperalkaline groundwaters and their interaction with a repository host rock IV: an examination of the Khushaym Matruk (central Jordan) and Maqarin (northern Jordan) sites. NDA-RWMD Technical Report, NDA, Moors Row, UK.
Russia
 
  • Eastern-Siberian Region
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Evenkia (Evenkiyskiy Autonomous okrug)
        • Nizhnyaya Tunguska River Basin (Lower Tunguska River)
Handbook of Mineralogy; Reverdatto, V. V., Pertsev, N. N., & Korolyuk, V. N. (1979). P_ {CO_2}-T-Evolution and origin of zoning in melilite during the regressive stage of contact metamorphism in carbonate-bearing rocks. Contributions to Mineralogy and Petrology, 70(2), 203-208
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Narin-Kunta
P.M. Kartashov data; Armbruster, T., Lazic, B., Gfeller, F., Galuskin, E.V., Galuskina, I.O., Savelyeva, V.B., Zadov, A.E., Pertsev, N.N., Dzierżanowski, P. (2011): Chlorine content and crystal chemistry of dellaite from the Birkhin gabbro massif, Eastern Siberia, Russia. Mineralogical Magazine, 75, 379-394.
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • Dovyren Highlands
American Mineralogist, Volume 94, pages 323–333, 2009
South Ossetia
 
  • Greater Caucasus Mountain Range
    • Kel’ volcanic area
      • Shadil-Khokh volcano
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.
UK
 
  • Northern Ireland
    • Co. Antrim
      • Glenoe
Henmi C, Kusachi I, Henmi K, Sabine P A, Young B R (1973) A new mineral bicchulite, the natural analogue of gehlenite hydrate, from Fuka, Okayama Prefecture, Japan and Carneal, County Antrim, Northern Ireland, Mineralogical Journal, 7, 243-251
  • Scotland
    • North West Highlands
      • Ardnamurchan
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Mineralogical Magazine 1965 34 : 1-15.
      • Isle of Muck
Tilley, C.E. (1947) The gabbro-limestone contact zone of Camas Mor, Muck, Inverness-shire. Comptes Rendus de la Société geologique de Finlande, No. 140, 97–105.
USA
 
  • California
    • Riverside Co.
      • Crestmore
        • Crestmore quarries
          • Sky Blue Hill
Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941) Section Across Commercial Quarry, Crestmore, California. American Mineralogist: 26: 366.
Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941) Section Across Commercial Quarry, Crestmore, California. American Mineralogist: 26: 352-381.
Larsen, Esper Signius & William F. Foshag (1921), Merwinite, a new calcium magnesium orthosilicate from Crestmore, California: American Mineralogist:6: 143-148; Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941) Section Across Commercial Quarry, Crestmore, California. American Mineralogist: 26: 366.
  • Montana
    • Cascade Co.
      • Neihart District (Montana District)
Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
  • New Mexico
    • Luna Co.
      • Tres Hermanas Mts
        • Tres Hermanas District
          • South Peak (South Sisters Peak)
NMGS 21st Field Conference
  • Texas
    • Brewster Co.
      • Christmas Mts
Rocks & Minerals (1991): 66:3: 196-224.
    • Culberson Co.
      • Apache Peak area
Am Min 51:1766-1774
      • Sierra Diablo
R&M 66:3 pp 196-224
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