Item talk:Q162490

Mindat Short Description

Zeolite Group. Laumontite Subgroup.

Normally it dehydrates in air to form a white powder. Specimens should be kept moist to prevent decomposition.

Geoscience Ontology Status Notes

Originally named lomonite by Werner: Jameson R (1805) Lomonite, System of Mineralogy II, Bell and Bradfute (Edinburgh, U.K.) 539-540 Renamed laumonite: Haüy R J (1809) Laumonite, in Tableau Comparatif des Résultats de Cristallographie et de l'Analyse Chimique Relativement á la Classification des Minéraux, Courcier (Paris, France) 195-196 Renamed laumontite: von Leonhard K C (1821) Laumontit, in Handbuch der Oryktognosie, Mohr and Winter (Heidelberg, Germany) 448-449

IMA Formula (from Mindat)

CaAl₂Si₄O₁₂ · 4H₂O

RRUFF Formula (from Geoscience Ontology)

Ca(Si₄Al₂)O₁₂·4H₂O

Additional References

• http://www.handbookofmineralogy.com/pdfs/laumontite.pdf

• http://webmineral.com/data/Laumontite.shtml