Laumontite

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

History

Activities related to discovery and approval of the group members

Structural context

Laumontite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/m
a14.5279—14.8913 (14.7708)
b13.06601—13.1979 (13.1221)
c7.408—7.5648 (7.5091)
alpha90
beta109.92—112.121 (110.9402)
gamma90
volume1326.89—1388.21 (1359.2251)

Based on 20 measurements

Chemical context

Stoichiometric formulas

Laumontite
mindat.org
  • March 13, 2023CaAl2Si4O12·4H2O
IMA
  • March 13, 2023CaAl2Si4O12 · 4H2O
mineralogy.rocks
  • Aug. 30, 2022Ca(Si4Al2)O12·4H2O

Elements recorded on EPMA

20
Al
20
Ca
20
O
20
Si
18
H
2
D
1
K

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • colorless
      • gray
      • yellowish
      • brownish
      • golden brown
      Color noteOriginal color note from the source
      Colorless to pink, white, gray, yellowish, brownish, golden brown
      StreakStreak entities, recognized using a custom trained NER model
        Streak noteOriginal streak note from the source
        White
        Lustre
        Vitreous
        Pearly
        Fracture
        Irregular/Uneven
        Transparency
        Transparent
        Translucent
        Tenacity
        brittle
        Hardness
        3.5—4
        Measured density
        2.23—2.41
        Calculated density
        2.25