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Merwinite

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About MerwiniteHide

Herbert Eugene Merwin
Formula:
Ca3Mg(SiO4)2
Colour:
White, colorless, light green, light gray green
Lustre:
Vitreous, Sub-Vitreous, Greasy
Hardness:
6
Specific Gravity:
3.15 - 3.32
Crystal System:
Monoclinic
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 MerwiniteHide

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 MerwiniteHide

Vitreous, Sub-Vitreous, Greasy
Transparency:
Transparent
Colour:
White, colorless, light green, light gray green
Streak:
White
Hardness:
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 MerwiniteHide

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 MerwiniteHide

Formula:
Ca3Mg(SiO4)2
Common Impurities:
Al,Fe

Crystallography of MerwiniteHide

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 V:
658.15 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Polysynthetic {100}
Comment:
Distorted glaserite structure, not an olivine.

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
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 MerwiniteHide

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

Other Language Names for MerwiniteHide

German:Merwinit
Simplified Chinese:镁硅钙石
镁蔷薇辉石
Spanish:Merwinita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Gehlenite5 photos of Merwinite associated with Gehlenite on mindat.org.
Calcite3 photos of Merwinite associated with Calcite on mindat.org.
Vesuvianite2 photos of Merwinite associated with Vesuvianite on mindat.org.
Nasonite2 photos of Merwinite associated with Nasonite on mindat.org.
Ganomalite2 photos of Merwinite associated with Ganomalite on mindat.org.
Clinozoisite2 photos of Merwinite associated with Clinozoisite on mindat.org.
Jennite1 photo of Merwinite associated with Jennite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AD.AdrianiteCa12(Al4Mg3Si7)O32Cl6Iso. 4 3m : I4 3d
9.AD.05LarniteCa2SiO4Mon.
9.AD.10Calcio-olivineCa2SiO4Orth. mmm (2/m 2/m 2/m)
9.AD.20BredigiteCa7Mg(SiO4)4Orth.
9.AD.25AndraditeCa3Fe3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25AlmandineFe2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3Iso.
9.AD.25GoldmaniteCa3V3+2(SiO4)3Iso.
9.AD.25GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4xIso. m3m (4/m 3 2/m) : Ia3d
9.AD.25HydroandraditeCa3Fe3+2(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4x (x = 1.5-3)Iso.
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3Iso.
9.AD.25KnorringiteMg3Cr2(SiO4)3Iso.
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25PyropeMg3Al2(SiO4)3Iso.
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3Iso.
9.AD.25SpessartineMn2+3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25UvaroviteCa3Cr2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3Iso. 4 3m : I4 3d
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25Momoiite(Mn2+,Ca)3V3+2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.25EltyubyuiteCa12Fe3+10Si4O32Cl6Iso. 4 3m : I4 3d
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12Iso. m3m (4/m 3 2/m) : Ia3d
9.AD.30CoffiniteU(SiO4) · nH2OTet.
9.AD.30HafnonHfSiO4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30ThoriteTh(SiO4)Tet.
9.AD.30ZirconZr(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.30Stetindite-(Ce)Ce(SiO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
9.AD.35HuttoniteThSiO4Mon.
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
9.AD.40EulytineBi4(SiO4)3Iso. 4 3m : I4 3d
9.AD.45ReiditeZrSiO4Tet. 4/m : I41/a

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.6.1CombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
14.6.2PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2OMon.
14.6.5TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2OMon. 2/m : P2/b
14.6.7RhodesiteKHCa2Si8O19 · 5H2OOrth. mmm (2/m 2/m 2/m)
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
14.6.9ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
14.6.10MonticelliteCaMgSiO4Orth.
14.6.12DiopsideCaMgSi2O6Mon. 2/m : B2/b
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m

Fluorescence of MerwiniteHide

Not fluorescent

Other InformationHide

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 petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for MerwiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 MerwiniteHide

Localities for MerwiniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
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.
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 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., and 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
    • Highland
      • Ardnamurchan
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Agrell, S.O. (1965) Polythermal Metamorphism of Limestones at Kilchoan, Ardnamurchan. Mineralogical Magazine, vol. 34, n° 268, 1-15.; Embrey, P.G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, vol. 42, n° 322, 169-177 (referring to Agrell);
      • 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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