Image: <a rel="nofollow" class="external text" href="http://www.mindat.org/user-2830.html#0">John Sobolewski</a> (JSS) (CC BY 3.0)
hexagonaluncommonSilicates (Zeolite Group)
Gmelinite-Na
(Na2,Ca,K2)Al2Si4O12·6H2O
A mass of pink, hexagonal gmelinite-Na crystals, some associated with delicate white natrolite needles.
Gmelinite-Na Physical Properties
Mohs Hardness
4.5Crystal System
hexagonalLuster
vitreousStreak Color
whiteCleavage
distinct on {1010}Fracture
unevenSpecific Gravity
2.1Colors
pink, white, colorless, yellow, reddish, brownishTransparency
transparentType Locality
Flinders area, Victoria, AustraliaMineral Group
Silicates (Zeolite Group)Uses
collector, industrial (as a zeolite)Associated Minerals
natrolite, calcite, apophyllite, other zeolitesRarity
uncommonGeological Context
Gmelinite-Na is a zeolite mineral typically found in the cavities of basaltic and other volcanic rocks, forming as a secondary mineral during hydrothermal alteration.
