Mindat.org (original) (raw)

Classification

Species:

'Heulandite Subgroup' (not an IMA approved species)

Formula:

(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O

Confirmation

Validity:

Believed Valid

Data

Mineral Data:

Click here to view Heulandite Subgroup data

Locality Data:

Click here to view Tongonan geothermal field, Leyte, Samar Island, Eastern Visayas Region, Visayas, Philippines

Data Identifiers

Mindat Occurrence Record ID:

613938

Long-form Identifier:

1:3:613938:4

GUID (UUID V4):

b195c289-90f0-434c-a0b5-9d5fc1874430

References

Bird, D.K., Schiffman, P., Elders, W.A., Williams, A.E., McDowell, S.D. (1984) Calc-silicate mineralization in active geothermal systems. Economic Geology 79:4, 671-695.