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Pectolite

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Formula:
NaCa2(HSi3O9)
System:
Triclinic
Colour:
Colourless, white, pale ...
Hardness:
4½ - 5
Name:
Named in 1828 by Franz von Kobell from the Greek πηκτοζ for "well put together", in allusion to its resistance to pulverization.

Classification of Pectolite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.DG.05

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
65.2.1.4a

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
2 : Single-Width Unbranched Chains, W=1 with chains P=3
14.6.2

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both
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First Recorded Occurrence of Pectolite

Year of Discovery:
1828

Occurrences of Pectolite

Geological Setting:
Primary mineral in nepheline syenites. Hydrothermal mineral in cavities in basalts and diabases. In serpentinites and peridotites.

Physical Properties of Pectolite

Sub-Vitreous, Silky
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless, white, pale pink, greenish, pale blue
Streak:
White
Hardness (Mohs):
4½ - 5
Tenacity:
Brittle
Cleavage:
Perfect
on {100} and {001}
Fracture:
Irregular/Uneven
Comment:
Tough when compact.
Density:
2.84 - 2.9 g/cm3 (Measured)    2.87 g/cm3 (Calculated)

Crystallography of Pectolite

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Pectolite-M2abc
NaCa2[HSi3O9]
 
 
 

 
 
 
X-Ray Powder Diffraction:
Image Loading

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

Optical Data of Pectolite

Type:
Biaxial (+)
RI values:
nα = 1.594 - 1.610 nβ = 1.603 - 1.614 nγ = 1.631 - 1.642
2V:
Measured: 50° to 63°, Calculated: 42° to 60°
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v weak to very strong

Chemical Properties of Pectolite

Formula:
NaCa2(HSi3O9)
Essential elements:
All elements listed in formula:
Common Impurities:
K,Fe,Mg,Al,H2O

Relationship of Pectolite to other Species

Series:
Forms a series with Sérandite (see here)
Other Members of Group:
BustamiteCaMn2+(Si2O6)
FerrobustamiteCaFe2+(Si2O6)
Keatingine
SéranditeNa(Mn2+,Ca)2(HSi3O9)
TanohataiteLiMn2(HSi3O9)
WollastoniteCaSiO3
9.DG.05BustamiteCaMn2+(Si2O6)
9.DG.05FerrobustamiteCaFe2+(Si2O6)
9.DG.05SéranditeNa(Mn2+,Ca)2(HSi3O9)
9.DG.05WollastoniteCaSiO3
9.DG.05Wollastonite-1ACaSiO3
9.DG.07CascanditeCa(Sc,Fe3+)(HSi3O9)
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2O
9.DG.10Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.15FoshagiteCa4(Si3O9)(OH)2
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2O
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2O
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2O
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4
9.DG.35XonotliteCa6(Si6O17)(OH)2
9.DG.40HillebranditeCa2(SiO3)(OH)2
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
9.DG.45ChivruaiiteCa4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O
9.DG.55EpididymiteNa2Be2Si6O15 · H2O
9.DG.60EudidymiteNa2Be2Si6O15 · H2O
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2O
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
9.DG.70LitidioniteCuNaKSi4O10
9.DG.70ManaksiteKNaMnSi4O10
9.DG.75TinaksiteK2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)]
9.DG.75TokkoiteK2Ca4Si7O17(O,OH,F)4
9.DG.75SenkevichiteCsKNaCa2Ti[O|Si7O18(OH)]
9.DG.80CanasiteK2Na4Ca5(Si12O30(OH,F)4
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2O
9.DG.85MiseriteK(Ca,Ce)4Si5O13(OH)3
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2O
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O
9.DG.95Yuksporite(K,Ba)NaCa2(Si,Ti)4O11(F,OH) · H2O
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14
14.6.1CombeiteNa2Ca2(Si6O18)0.5
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteCa2(K,Na)Si3O8(F,OH)2
14.6.5TokkoiteK2Ca4Si7O17(O,OH,F)4
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2O
14.6.7RhodesiteKHCa2Si8O19 · 5H2O
14.6.8MiseriteK(Ca,Ce)4Si5O13(OH)3
14.6.9ÅkermaniteCa2Mg(Si2O7)
14.6.10MonticelliteCaMgSiO4
14.6.11MerwiniteCa3Mg(SiO4)2
14.6.12DiopsideCaMgSi2O6
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2

Other Names for Pectolite

Name in Other Languages:

Other Information

Other Information:
May be triboluminescent.
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 Pectolite

Reference List:
American Mineralogist (1978): 63: 427.

Zeitschrift für Kristallographie: 108: 248-262.

Zeitschrift für Kristallographie: 125: 298-316.

Hammer, V.M.F., Libowitzky, E., and Rossman, G.R. (1998) Single-crystal IR spectroscopy of very strong hydrogen bonds in pectolite, NaCa2[Si3O4(OH)], and serandite, NaMn2[Si3O4(OH)]. American Mineralogist: 83: 569-576.

Internet Links for Pectolite

Specimens:
The following Pectolite specimens are currently listed for sale on minfind.com.

Localities for Pectolite

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.
Mineral and/or Locality  
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