Mineralogy Database

Pectolite Mineral Data

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General Pectolite Information

Help on Chemical  Formula: Chemical Formula: NaCa2Si3O8(OH)
Help on Composition: Composition: Molecular Weight = 332.40 gm
   Sodium     6.92 %  Na    9.32 % Na2O
   Calcium   24.11 %  Ca   33.74 % CaO
   Silicon   25.35 %  Si   54.23 % SiO2
   Hydrogen   0.30 %  H     2.71 % H2O
   Oxygen    43.32 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa2(Si3O8)(OH)
Help on Environment: Environment: Secondary mineral in basaltic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1828
Help on Locality: Locality: Prospect Park quarry, northern New Jersey. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek pektos - "compacted" and lithos - "stone."
Help on Name Pronunciation: Name Pronunciation: Pectolite + Pronunciation Say PECTOLITE
Help on Synonym: Synonym: ICSD 34945
  Larimar - blue
  PDF 33-1223

Pectolite Image

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  Pectolite   Aegirine

Comments: White, cottony pectolite tufts with acicular aegirine.
Location: 3M quarry, Little Rock, Pulaski County, Arkansas, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Sugilite   Pectolite

Comments: Sharp terminated purple crystals of sugilite to 5mm on white, acicular pectolite.
Location: Wessels Mine, Kalahari, South Africa. Scale: Picture size 1.5 cm.
© John Veevaert

Pectolite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1349:1:0.9971
Help on Cell Dimensions: Cell Dimensions: a = 7.99, b = 7.04, c = 7.02, Z = 2; alpha = 90.05°, beta = 95°, gamma = 102.467° V = 384.09 Den(Calc)= 2.87
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.901(1), 3.082(0.4), 3.061(0.2),

Physical Properties of Pectolite

Help on Cleavage: Cleavage: {001} Perfect, {100} Perfect
Help on Color: Color: White, Gray, Light pink, Light green.
Help on Density: Density: 2.86
Help on Diaphaneity: Diaphaneity: Subtranslucent to translucent to opaque
Help on Fracture: Fracture: Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Fluorescent and Triboluminescent, Short UV=pink, Long UV=orange-pink.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Pectolite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2145,KPDmeas= 0.2153,KC= 0.2106
Ncalc = 1.6
Help on Optical Data: Optical Data: Biaxial (+), a=1.594-1.61, b=1.603-1.614, g=1.631-1.642, bire=0.0320-0.0370, 2V(Calc)=42-60, 2V(Meas)=50-63. Dispersion very weak, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Pectolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Pectolite =2.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPectolite = 4.04 barns/electron
U=PEPectolite x rElectron Density= 11.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pectolite is Not Radioactive

Pectolite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.02)with chains P=3
  (65.02.01)Wollastonite group Wollastonite-1A CaSiO3 P1 1 Wollastonite-2M* CaSiO3 P 21 2 Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1 Bustamite (Mn,Ca)3Si3O9 P1 1 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1 Pectolite NaCa2Si3O8(OH) P1 1 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono Tanohataite! LiMn2Si3O8(OH) P1 1
Help on  Strunz Class: Strunz Class: 09.DG.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
09.DG.05 Bustamite (Mn,Ca)3Si3O9 P1 1
09.DG.05 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1
09.DG.05 Pectolite NaCa2Si3O8(OH) P1 1
09.DG.05 Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1
09.DG.05 Wollastonite-1A CaSiO3 P1 1
09.DG.05 Wollastonite-2M* CaSiO3 P 21 2
09.DG.05 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

Other Pectolite Information

Help on References: References: NAME( Sinkankas66) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Pectolite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - Franklin Minerals(Palache)
10 - GeoScienceWorld
11 - Glendale Community College
12 - Google Images
13 - Google Scholar
14 - Handbook of Mineralogy (MinSocAm)
15 - Handbook of Mineralogy (UofA)
16 - MinDAT
17 - Mineral and Gemstone Kingdom
18 - Mineralienatlas (Deutsch)
19 - Online Mineral Museum
20 - QUT Mineral Atlas
21 - Ruff.Info
22 - Tradeshop.com - The Rainbow of Gems

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Dana No: Strunz No: 09.DG.05





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