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About RuiziteHide

Joe Ruiz and Dick Thomssen
Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O
formerly reported as Ca2Mn3+2[(OH)2|H2Si4O13].2H2O
orange, red-brown
Specific Gravity:
Crystal System:
Member of:
Named after Mr. Joe Ana Ruiz (1924-2017), Pharmacist, Justice of the Peace, mineralogist and mineral collector of Mammoth, Arizona. Life Member Mineralogical Society of Arizona.
Isostructural with:
The Ca-analogue of strontioruizite.

The structure (basing on recent refinement by Fendrich et al., 2016) is based on [010] chains consisting of edge-sharing MnO6 octa­hedra; the octahedra are surrounded by finite [Si4O11(OH)2] chains. Calcium atoms, [7]Ca, are located in cavities formed by the above atom groupings.

Classification of RuiziteHide

Approval year:

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
2 : Insular Si3O10 and Larger Noncyclic Groups with [Si4O13] groups

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe

Physical Properties of RuiziteHide

orange, red-brown
apricot yellow
2.9(1) g/cm3 (Measured)    2.997 g/cm3 (Calculated)

Optical Data of RuiziteHide

Biaxial (-)
RI values:
nα = 1.663 nβ = 1.715 nγ = 1.734
Measured: 60° , Calculated: 60°
Max Birefringence:
δ = 0.071
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
strong r > v

Chemical Properties of RuiziteHide

Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O

formerly reported as Ca2Mn3+2[(OH)2|H2Si4O13].2H2O
IMA Formula:
Ca2Mn3+2Si4O11(OH)4 · 2H2O

Crystallography of RuiziteHide

Crystal System:
Class (H-M):
2 - Sphenoidal
Cell Parameters:
a = 9.0360(3) Å, b = 6.1682(2) Å, c = 11.9601(4) Å
β = 91.433(2)°
a:b:c = 1.465 : 1 : 1.939
Unit Cell V:
666.41 ų
Euhedral prismatic crystals to 1mm, spherules of radial acicular crystals.
Common on {100}
Space group: A2; Fendrich et al. (2016) have shown that the first-study space group (A2) is more likely than the further reported one (C2/m)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000967RuiziteMoore P B, Shen J, Araki T (1985) Crystal chemistry of the (M2)3+ phi2 sheet: Structural principles and crystal structures of ruizite, macfallite and orientite American Mineralogist 70 171-1811985Nchwaning mine, Kalahari manganese field, South Africa0293
0020603RuiziteFendrich K V, Downs R T, Origlieri M J (2016) Redetermination of ruizite, Ca2Mn3+2[Si4O11(OH)](OH)2*2H2O Acta Crystallographica E72 959-9632016Wessels mine, Northern Cape Province, South Africa0293
0019985RuiziteHawthorne F C (1984) The crystal structure of ruizite, a sorosilicate with an (Si4PHI13) cluster Tschermaks Mineralogische und Petrographische Mitteilungen 33 135-1461984Wessels mine, Kalahari manganese fields, South Africa0293
CIF Raw Data - click here to close

Type Occurrence of RuiziteHide

Place of Conservation of Type Material:
Smithsonian 136689
Geological Setting of Type Material:
Cooling of a high temperature calc-silicate rock under oxidizing conditions.

Synonyms of RuiziteHide

Other Language Names for RuiziteHide


Relationship of Ruizite to other SpeciesHide

Member of:
Other Members of this group:
StrontioruiziteSr2Mn3+2Si4O11(OH)4 · 2H2OMon. 2 : B2
Taniajacoite SrCaMn3+2Si4O11(OH)4 · 2H2OTric.

Common AssociatesHide

Associated Minerals Based on Photo Data:
14 photos of Ruizite associated with Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
11 photos of Ruizite associated with KinoiteCa2Cu2(H2O)2[Si3O10]
7 photos of Ruizite associated with Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
5 photos of Ruizite associated with QuartzSiO2
4 photos of Ruizite associated with GilaliteCu5Si6O17 · 7H2O
4 photos of Ruizite associated with ClinoenstatiteMgSiO3
4 photos of Ruizite associated with SugiliteKNa2Fe3+2(Li3Si12)O30
3 photos of Ruizite associated with CalciteCaCO3
3 photos of Ruizite associated with ApachiteCu9Si10O29 · 11H2O
2 photos of Ruizite associated with NorrishiteKLiMn3+2(Si4O10)O2

Related Minerals - Nickel-Strunz GroupingHide

9.BJ.ArsenmedaiteMn2+6 As5+Si5O18(OH)Mon. 2/m
9.BJ.05OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth.
9.BJ.15TrabzoniteCa4(Si3O9)(OH)2Orth. mm2 : Ama2
9.BJ.25TiragalloiteMn2+4As5+Si3O12(OH)Mon. 2/m
9.BJ.40Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m)
9.BJ.40Ardennite-(V)Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m) : Pmmn
9.BJ.50KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
9.BJ.55ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
9.BJ.60HubeiteCa2Mn2+Fe3+Si4O12(OH) · 2H2OTric.
9.BJ.65Cassagnaite(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8Orth. mmm (2/m 2/m 2/m) : Cmcm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.18.3ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
14.18.4NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
14.18.5ShafranovskiteNa3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2OTrig.
14.18.6AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.8KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
14.18.13BustamiteCaMn2+(Si2O6)Tric. 1 : P1
14.18.14GlaucochroiteCaMn2+SiO4Orth. mmm (2/m 2/m 2/m)
14.18.15Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
14.18.16SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
14.18.18JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
14.18.19NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
14.18.20OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
14.18.21InesiteCa2(Mn,Fe)7Si10O28(OH)2 · 5H2OTric. 1 : P1
14.18.22OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O Orth.
14.18.24BostwickiteCaMn3+6Si3O16 · 7H2OOrth.
14.18.25KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
14.18.27SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
14.18.29MarsturiteNaCaMn3Si5O14(OH)Tric. 1 : P1
14.18.30RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
14.18.31Richterite{Na}{NaCa}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.18.32Byelorussite-(Ce)NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2OOrth. mm2 : Ama2
14.18.35PyroxmangiteMn2+SiO3Tric. 1
14.18.37Neotocite(Mn,Fe,Mg)SiO3 · H2OAmor.
14.18.38BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1

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.

References for RuiziteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1978): 63: 794-795.
Moore, P.B., J. Shen, and T. Araki (1985) Crystal chemistry of the 2∞[M 3+ 2ф2(TO4)2] sheet: structural principles and crystal structures of ruizite, macfallite and orientite. American Mineralogist (1985): 70: 171-181.
Tschermaks Mineralogische und Petrographische Mitteilungen: 33: 135-146.
Fendrich, K.V., Downs, R.T., Origlieri, M.J. (2016): Redetermination of ruizite, Ca2Mn3+2[Si4O11(OH)2](OH)2·2H2O. Acta Crystallographica: E72: 959-963; (2016)

Internet Links for RuiziteHide

Localities for RuiziteHide

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.
  • Liguria
    • La Spezia Province
      • Borghetto di Vara
Balestra, C., Kolitsch, U., Blass, G., Callegari, A.M., Boiocchi, M., Armellino, G., Ciriotti, M.E., Ambrino, P. Bracco, R. (2009): Mineralogia ligure 2007-2008: novità caratterizzate dal Servizio UK dell’AMI. Micro, 1-2009, 78-99.
South Africa
  • Northern Cape
    • Kalahari manganese field
      • Hotazel
Von Bezing, K. L. et al. (1991) The Kalahari manganese field: An Update, Mineralogical Record 22(4) 279-302;
      • Kuruman
        • N'Chwaning Mines
Y.Okazaki collection
Cairncross, B., Dixon, R. (1995) Cairncross, B., Dixon, R. (1995) Minerals of South Africa. Geological Society of South Africa, PO Box 44283, Linden 2104, South Africa.
  • Arizona
    • Gila Co.
      • Banner Mining District
        • Christmas
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 231, 358. ; Bob Meyer (2012) Micro Mineral Collector. Friends of Mineralogy National Newsletter 42:10-13
  • Pennsylvania
    • Lebanon Co.
      • Cornwall Borough (Cornwall)
Kearns, L.E. & Kearns, C.A. (2008) Mineral News, 24, #1, 8-9.
Mineral and/or Locality  
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