near Dayton, Mason County, Washington, USA |
| NaAlSi2O6 . H2O
- Occurs as small colorless trapezohedral crystlas lining some amygdules. Transparent crystals turn opaque when removed from the ground due to dehydration.
(K,Na)Ca4Si8O20(F,OH) - 8H2O
- Occurs as translucent crystals to 1". Small crystals appear cubic due to absence or pyramidal faces. Crystals turn opaque white due to dehydration.
| CaCO3
- Occurs as beautiful tea-colored rhombohedral crystals. Twins are common. Crystals are found in vugs associated with natrolite and/or analcime. Crystals are phosphorescent under short- and long-wave ultraviolet light. | (Mg,Fe)3(Si,Al)4(Mg,Fe)3O10(OH)8
- Massive chlorite occurs interstitial to individual pillows and as matrix grains within the metabasalt. Chlorite is a product of low-grade metamorphism.
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Na2Ca2Al6Si9O30 - 8H2O
- Occurs as fine fiber-like sprays with individual needles to 1"
| Na2Al2Si3O10 . 2H2O
- Occurs as radiating crystal groups lining large pockets up to several feet long. Some natrolite pockets also contain a late stage clay mineral that coats the needles. Some pockets are completely filled with laminated clay.
| FeS2
- Occurs as mm-sized disseminated grains in altered basalt adjacent to amygdules.
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NATROLITE MinSpin© |
White APOPHYLLITE and NATROLITE |
ANALCIME |
ANALCIME |
Twinned CALCITE |
CALCITE, NATROLITE |
CALCITE, NATROLITE |
NATROLITE, ANALCIME |
Radiating NATROLITE |
Radiating NATROLITE on basalt matrix |
Radiating NATROLITE |
NATROLITE, CALCITE |
NATROLITE |
Babcock R. S., Burmester R. F., Engebretson, D. C., Warnock A., Clark K. P. (1992) A Rifted Origin for the Crescent Basalts and Related Rocks in the Northern Coast Range Volcanic Province, Washington and British Columbia. Journal of Geophysical Research, B, Solid Earth and Planets. 97(5), 6799-6821. Lasmanis, Raymond (January, February 1988) Minerals of the Crescent Formation, Robertson Pit, Mason County, Washington. Rocks & Minerals. 63(01), 25-30. |