near Shelton, Mason County, Washington, USA |
(K,Na)Ca4Si8O20(F,OH) - 8H2O - Occurs as translucent to light green crystals to a about 1 inch. | |
CaCO3 - Occurs as beautiful tea-colored rhombohedral crystals to a few inches. Interpenetration twins are common. | |
(Mg,Fe)3(Si,Al)4(Mg,Fe)3O10(OH)8 - Chlorite occurs as a fine-grained coating of amygdules. | |
(Ca,Na)2-3Al3(Al,Si)2Si13O36 - 12H2O - Occurs as translucent white to peach-colored fan-shaped crystals to about 2 inches. | |
NaCa2Al5Si13O36 . 16H2O - Occurs as translucent to opaque white crystals to about 2 inches. Opaque crystals have undergone dehydration. "Bow-ties" are common. |
APOPHYLLITE |
APOPHYLLITE |
APOPHYLLITE |
CALCITE and STILBITE |
Pink HEULANDITE with STILBITE |
Light green HEULANDITE |
HEULANDITE with CHLORITE inclusions and APOPHYLLITE |
HEULANDITE on CHLORITE |
STILBITE on APOPHYLLITE |
STILBITE and LAUMONTITE on CHLORITE |
STILBITE |
HEULANDITE on STILBITE |
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. |