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Datolite

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Formula:
Ca(HBSiO5)
Colour:
White, greyish, pale green, red, yellow, etc.
Lustre:
Vitreous, Resinous
Hardness:
5 - 5½
Specific Gravity:
2.96 - 3
Crystal System:
Monoclinic
Name:
Named in 1806 by Jens Esmark from the Greek δατεῖσθαι for "to divide", in reference to the granular texture of massive varieties.
Gadolinite-Datolite Group. (See also Anchi-Zeolite)

The structure of datolite consists of sheets of four- and eight-membered rings of corner-sharing, alternating (HBO4) and (SiO4) tetrahedra, classifying it as a phyllo-borosilicate. The net formula of the anion is (HBSiO5)n, with (HBSiO5) as the repeating unit (Foit et al., 1973). Instead of (HBSiO5), the formula may also be written as (BSiO4OH) or (BSiO4(OH)), indicating that the proton is bonded to one of the oxygen atoms. The mineral does not contain any isolated hydroxide ions, though.

Compare also the closely related Bakerite and Shimazakiite.

Visit gemdat.org for gemological information about Datolite.


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Classification of DatoliteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.AJ.20

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.2.1a.1

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
17.5.10

17 : Silicates Containing other Anions
5 : Borosilicates

Pronounciation of DatoliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of DatoliteHide

Vitreous, Resinous
Transparency:
Transparent, Translucent, Opaque
Colour:
White, greyish, pale green, red, yellow, etc.
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.96 - 3 g/cm3 (Measured)    3 g/cm3 (Calculated)

Optical Data of DatoliteHide

Type:
Biaxial (-)
RI values:
nα = 1.626 nβ = 1.653 - 1.654 nγ = 1.670
2V:
Measured: 74° , Calculated: 72° to 74°
Max Birefringence:
δ = 0.044
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak r > v

Chemical Properties of DatoliteHide

Formula:
Ca(HBSiO5)
IMA Formula:
CaB(SiO4)(OH)
Common Impurities:
Mn,Mg,Al,Fe

Crystallography of DatoliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 9.62 Å, b = 7.6 Å, c = 4.84 Å
β = 90.15°
Ratio:
a:b:c = 1.266 : 1 : 0.637
Unit Cell V:
353.86 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Short prismatic, lenticular, botryoidal, granular to compact, cryptocrystalline.

X-Ray Powder DiffractionHide

Image Loading

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

Type Occurrence of DatoliteHide

Synonyms of DatoliteHide

Other Language Names for DatoliteHide

Dutch:Datoliet
Italian:Datolite
Lithuanian:Datolitas
Simplified Chinese:硅硼钙石
Spanish:Datolita
Swedish:Datolit
Traditional Chinese:矽硼鈣石

Varieties of DatoliteHide

BotryoliteA variety of Datolite found in a botryoidal form.

Relationship of Datolite to other SpeciesHide

Other Members of this group:
HomiliteCa2(Fe2+,Mg)B2Si2O10Mon.

Common AssociatesHide

Axinite GroupA group of triclinic borosilicate minerals.
CalciteCaCO3
DanburiteCaB2Si2O8
Garnet Structural GroupX3Z2(TO4)3
PrehniteCa2Al2Si3O10(OH)2
Zeolite GroupA group name for a large number of framework alumosilicates (and, rarely, beryllosilicates, zincosilicates, ...
Associated Minerals Based on Photo Data:
Calcite133 photos of Datolite associated with Calcite on mindat.org.
Quartz113 photos of Datolite associated with Quartz on mindat.org.
Prehnite86 photos of Datolite associated with Prehnite on mindat.org.
Copper59 photos of Datolite associated with Copper on mindat.org.
Apophyllite52 photos of Datolite associated with Apophyllite on mindat.org.
Pectolite40 photos of Datolite associated with Pectolite on mindat.org.
Pyrite40 photos of Datolite associated with Pyrite on mindat.org.
Chalcopyrite39 photos of Datolite associated with Chalcopyrite on mindat.org.
Hausmannite36 photos of Datolite associated with Hausmannite on mindat.org.
Natrolite35 photos of Datolite associated with Natrolite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3Orth.
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon.
9.AJ.20BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10Mon.
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig.
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m : R3m
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m : R3m
9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

54.2.1a.2Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
54.2.1a.3Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
54.2.1a.4Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth.
17.5.2ReedmergneriteNaBSi3O8Tric.
17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.6KalborsiteK6Al4BSi6O20(OH)4ClTet.
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2Mon.
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)Ca4Ce3+2Ti◻(B4Si4O22)(OH)2Mon.
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.23Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OHTric.
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4Mon.
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.33LeucospheniteBaNa4Ti2B2Si10O30Mon.
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2ClxOrth.
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.37Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37Tric.
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.41AxiniteTric.
17.5.42TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10Mon.
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2Mon.

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.

Datolite in petrologyHide

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

References for DatoliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Klaproth, M.H. (1806) Chemische Untersuchung des Datoliths. Neues allgemeines Journal der Chemie. 6, 107-110
Klaproth, M.H. (1807) Chemische Untersuchung des Datoliths. Beiträge zur chemischen Kenntniss der Mineralkörper, Vierter Band, Rottmann Berlin, 354-359
Hausmann, J.F.L (1810) Bermerkungen über den Datolith, von der Nödebroe-Grube bei Arendal in Norwegen. Beiträge zur Naturkunde, 2, 59-67
Anderson, C. (1906) Mineralogical Notes: No. III - Axinite, petterdite, crocoite, datolite. Records of the Australian Museum: 6(3), 133-144.
Foit, Jr., F.F., Phillips, M.W., and Gibbs, G.V. (1973) A Refinement of the Crystal Structure of Datolite, CaBSiO4(OH). American Mineralogist 58, 909-914.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Bellatreccia, F., Cámara, F., Della Ventura, G. (2006) Datolite: a new occurrence in volcanic ejecta (Pitigliano, Toscana, Italy) and crystal-structure refinement. Rendiconti dell'Accademia Nazionale dei Lincei, Scienze Fisiche e Naturali, Serie 9, 17, 289-298.
Rocks & Minerals (2010) 85:338-345

Internet Links for DatoliteHide

Localities for DatoliteHide

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 ListShow

Mineral and/or Locality  
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