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Pectolite information


Pectolite
General
CategoryInosilicate mineral
Formula
(repeating unit)
NaCa2Si3O8(OH)
IMA symbolPct[1]
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 7.99 Å, b = 7.03 Å,
c = 7.03 Å; α = 90.51°,
β = 95.21°, γ = 102.53°; Z = 2
Identification
ColorColorless, whitish, grayish, yellowish
Crystal habitTabular to acicular, radiating fibrous, spheroidal, or columnar; massive
TwinningTwin axis [010] with composition plane [100], common
CleavagePerfect on {100} and {001}
FractureUneven
TenacityBrittle; tough when compact
Mohs scale hardness4.5 – 5
LusterSilky, subvitreous
StreakWhite
DiaphaneityTranslucent to opaque
Specific gravity2.84 – 2.90
Optical propertiesBiaxial (+)
Refractive indexnα = 1.594 – 1.610 nβ = 1.603 – 1.614 nγ = 1.631 – 1.642
Birefringenceδ = 0.037
2V angleMeasured: 50° to 63°, Calculated: 42° to 60°
Dispersionr > v weak to very strong
References[2][3][4]

Pectolite is a white to gray mineral, NaCa2Si3O8(OH), sodium calcium hydroxide inosilicate. It crystallizes in the triclinic system typically occurring in radiated or fibrous crystalline masses. It has a Mohs hardness of 4.5 to 5 and a specific gravity of 2.7 to 2.9. The gemstone variety, larimar, is a pale to sky blue. There is also a whitish form of the mineral from Alaska that is sometimes marketed as 'Alaska jade'.

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Handbook of Mineralogy
  3. ^ Mindat w/ localities
  4. ^ Webmineral

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Pectolite

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Pectolite is a white to gray mineral, NaCa2Si3O8(OH), sodium calcium hydroxide inosilicate. It crystallizes in the triclinic system typically occurring...

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Larimar

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Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, around the city of Barahona. Its...

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Lyonsite Varieties that are not valid species: Larimar (blue variety of pectolite) Lignite (a type of coal) Lodestone (a synonym of magnetite) Lublinite...

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Silicate mineral

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(Fe,Ca)SiO3 Pyroxenoid group Wollastonite – CaSiO3 Rhodonite – MnSiO3 Pectolite – NaCa2(Si3O8)(OH) Amphibole group Anthophyllite – (Mg,Fe)7Si8O22(OH)2...

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List of gemstones by species

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Fire opal Moss opal Painite Palygorskite Papagoite Pargasite Parisite Pectolite Larimar Pentlandite Peridot Periclase Perthite Petalite (castorite) Pezzottaite...

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Schizolite

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It was dropped from the valid species status in 1955 as a variety of pectolite based on Schaller's work. It's a member of the Wollastonite group. Marshall...

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Wollastonite

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PMID 30775646. Buerger, M. J. (1961). "The crystal structures of wollastonite and pectolite". Proceedings of the National Academy of Sciences. 47 (12): 1884–1888...

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Oilfield scale inhibition

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acmite, gyrolite, gehlenite, amorphous silica, quartz, cristobalite, pectolite Aluminium oxy-hydroxides AlO(OH) Boehmite, gibbsite, diaspore, corundum...

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Serandite

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is a member of the wollastonite group and is the manganese analogue of pectolite. It is sometimes used as a gemstone. Serandite was discovered on Rouma...

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Copper silicate

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called "Stefilia's Stone", is a rare blue variety of the silicate mineral pectolite that contains copper Papagoite, rare cyclosilicate mineral - calcium copper...

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Crystal habit

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romanechite Stellate Star-like, radial fibers found inside spherical habits, such as mamillary or reniform. hematite, pectolite, shattuckite, wavellite...

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Carletonite

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fluorite, ancylite, molybdenite, leucosphenite, lorenzenite, galena, albite, pectolite, apophyllite, leifite, microcline and arfvedsonite. Warr, L.N. (2021)...

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Villiaumite

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associated with aegirine, sodalite, nepheline, neptunite, lamprophyllite, pectolite, serandite, eudialyte, ussingite, chkalovite and zeolites. It has been...

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List of mineral symbols

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Phyllotungstite Ptgs Potassic-fluoro-hastingsite Pfhst Panethite Pne Pectolite Pct Picaite Pic Potassic-fluoro-pargasite Pflprg Panguite Pgu Peisleyite...

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Fouling

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acmite, gyrolite, gehlenite, amorphous silica, quartz, cristobalite, pectolite, xonotlite); Aluminium oxide hydroxides (boehmite, gibbsite, diaspore...

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Whin Sill

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Teesdale. Late stage hydrothermal mineralisation has filled the joints with pectolite. The dolerite has been carbonated as metasomatic selvages into veins and...

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Baoruco Mountain Range

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silicate hydrates of calcium and sodium. Larimar is a specific type of pectolite (occasionally as ratholite), a pyroxenoid mineral. Granberry, Julian,...

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Inesite

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Northern Cape, South Africa where Inesite is associated with datolite, pectolite, apophyllite, ruizite, orientite and quartz. Broken Hill, New South Wales...

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Golyshevite

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golyshevite are aegirine-augite, calcite, cancrinite, hedenbergite, orthoclase, pectolite, tacharanite, and thomsonite-Ca. Impurities in golyshevite include chlorine...

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Yuksporite

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massif it occurs in veins in nepheline syenite associated with titanite, pectolite, astrophyllite, biotite and aegirine. At the Murun Massif in the Sakha...

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Fluorcanasite

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a type locality at Mount Kukisvumchorr, Russia. It is associated with pectolite, microcline, nepheline, villiaumite, scherbakovite, rasvumite, lamprophyllite...

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Mogovidite

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of mogovidite: aegirine-augite, andradite, calcite, humite, nepheline, pectolite, scolecite, titanite, zircon. Chemical impurities in mogovidite include...

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Feklichevite

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Feklichevite coexists with aegirine-diopside, cancrinite, potassic feldspar, pectolite, titanite, hematite, and руrrhоtitе. Feklichevite has quite high admixtures...

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Porthoustock

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gabbro contain minerals such as analcite, epidote, hornblende, prehnite, pectolite, and calcite, some of which are rare. A gabbro tor, a natural rock formation...

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Jenny Polanco

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including detailing made from coral, horn, nacre, and larimar, a blue pectolite found only in the Dominican Republic. Polanco was also known for utilizing...

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Labyrinthite

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alkaline amphibole, lamprophyllite, lomonosovite, potassium feldspar, pectolite, sodalite, and villiaumite. Beside that given in the formula, other elements...

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Baratovite

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Associated minerals of biotite from Iwagi islet, Japan are: apatite, zircon, pectolite, sugilite, allanite, titanite, aegirine and albite. Warr, L.N. (2021)...

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