Editing Stilbite (section)

{{Short description|Tectosilicate mineral of the zeolite group}}
{{Infobox mineral
| name = Stilbite
| category = [[Tectosilicate]] [[minerals]], [[zeolite]] [[Mineral group|group]], stilbite subgroup
| boxwidth = 24
| boxbgcolor = 
| image = Fluorapophyllite-Stilbite-Ca-indi-52b.jpg
| imagesize   = 260px
| caption = 
| formula = Stilbite-Ca: NaCa<sub>4</sub>(Si<sub>27</sub>Al<sub>9</sub>)O<sub>72</sub>·28(H<sub>2</sub>O)<br />Stilbite-Na: Na<sub>9</sub>(Si<sub>27</sub>Al<sub>9</sub>)O<sub>72</sub>·28(H<sub>2</sub>O)
| IMAsymbol   = Stb<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref>
| molweight = Stilbite-Ca: 2,840 g/mol <br />Stilbite-Na: 2,864 g/mol
| strunz = 9.GE.10 (10 ed) <br /><small>8/J.23-30 (8 ed)</small>
| dana = 77.1.4.3
| system = [[Monoclinic]], <br />also triclinic and orthorhombic 
| class = Prismatic (2/m) <br /><small>(same [[H-M symbol]])</small>
| symmetry = ''C2/m'' (monoclinic) <br />''Amma'' (orthorhombic)
| color = Usually colorless, white or pink 
| habit = Thin tabular, aggregates sheaf-like or in bow-ties, also fibrous and globular.  
| lattice = 
| twinning = Very common on {001}
| cleavage = Perfect  on {010}
| fracture = Conchoidal or uneven
| tenacity = Brittle 
| mohs = {{frac|3|1|2}} to 4
| luster = Vitreous, pearly on {010}
| refractive = Nx = 1.479 to 1.492, Ny = 1.485 to 1.500, Nz = 1.489 to 1.505<ref name=ZW>Rudy W. Tschernich (1992) Zeolites of the World.  Geoscience Press</ref><ref name=WebminCa/>
Nx = 1.484 to 1.500, Ny = 1.492 to 1.507, Nz = 1.494 to 1.513<ref name=MindatCa/><ref name=HOM/>
| opticalprop = Biaxial (−)
| birefringence = 
| pleochroism = 
| streak = White
| gravity = 2.12 to 2.22 
| density = 
| melt = 
| fusibility = Easily fused by blowpipe (~1050 °C) to produce a white "enamel"<ref name=Klein>Klein, Cornelis and Cornelius S. Hurlbut, 1985, ''Manual of Mineralogy,'' Wiley, pp. 465–466 {{ISBN|0-471-80580-7}}</ref>
| diagnostic = 
| solubility = Decomposes in HCl<ref name=Klein/>
| diaphaneity = Transparent to translucent 
| other =   
| references = 
<ref name=WebminCa>{{Cite web|url=http://webmineral.com/data/Stilbite-Ca.shtml|title = Stilbite-Ca Mineral Data}}</ref><ref name=MindatCa>http://www.mindat.org/min-7313.html stilbite-Ca</ref> 
<ref name=HOM>{{Cite web |url=http://www.handbookofmineralogy.org/pdfs/stilbiteca.pdf |title=Archived copy |access-date=2010-07-29 |archive-date=2020-03-29 |archive-url=https://web.archive.org/web/20200329041312/http://www.handbookofmineralogy.org/pdfs/stilbiteca.pdf |url-status=dead }}</ref><ref name=Dana>Gaines et al (1997) Dana’s New Mineralogy Eighth Edition. Wiley</ref> 
<ref name=MindatNa>http://www.mindat.org/min-7314.html stilbite-Na</ref><ref name=WebminNa>{{Cite web|url=http://webmineral.com/data/Stilbite-Na.shtml|title = Stilbite-Na Mineral Data}}</ref><ref>{{cite journal |last1=Slaughter |first1=M. |journal=American Mineralogist |volume=55 |year=1970 |pages=387–397 |title=Crystal structure of stilbite |url=https://pubs.geoscienceworld.org/msa/ammin/article-abstract/55/3-4_Part_1/387/540613 |access-date=30 December 2020}}</ref><ref>{{cite journal |last1=Cruciani |first1=Giuseppe |last2=Artioli |first2=Gilberto |last3=Gualtieri |first3=Alessandro |last4=Stahl |first4=Kenny |last5=Hanson |first5=Jonathan C. |title=Dehydration dynamics of stilbite using synchrotron X-ray powder diffraction |journal=American Mineralogist |date=1 August 1997 |volume=82 |issue=7–8 |pages=729–739 |doi=10.2138/am-1997-7-810|bibcode=1997AmMin..82..729C |s2cid=99122598 }}</ref>}}
{{Other uses|Stiblite}}
'''Stilbite''' is the name of a series of [[tectosilicate]] minerals of the [[zeolite]] group. Prior to 1997, stilbite was recognized as a [[mineral]] species, but a reclassification in 1997 by the [[International Mineralogical Association]] changed it to a series name, with the mineral species being named:

* Stilbite-Ca
* Stilbite-Na, sometimes also called ''[[stiblite]]''<ref name="kriv">''Krivovichev V. G.'' Mineralogical glossary. Scientific editor [[:uk:Булах Андрій Глібович|A. G. Bulakh]]. — St.Petersburg: St.Petersburg Univ. Publ. House. 2009. — 556 p. — ISBN 978-5-288-04863-0</ref>{{rp|325}}

Stilbite-Ca, by far the more common of the two, is a hydrous calcium sodium and aluminium silicate, [[Sodium|Na]][[Calcium|Ca]]<sub>4</sub>([[Silicon|Si]]<sub>27</sub>[[Aluminium|Al]]<sub>9</sub>)[[Oxygen|O]]<sub>72</sub>·28([[Hydrogen|H]]<sub>2</sub>O). In the case of stilbite-Na, sodium dominates over calcium.  The species are visually indistinguishable, and the series name stilbite is still used whenever testing has not been performed.