Erionite or Offratite, Rock Island Dam, Columbia River, Douglas, WA, by Charles M. Nelson

ERIONITE OR OFFRETITE, ROCK ISLAND DAM, DOUGLAS COUNTY, WA Straight or curved, six sided crystals with flat ends. Commonly associated with Heulandite and Paulingnite. Frequently with small balls of an unidentified maineral growing on the sides or, espcecially, the ends.
4-9-86 No. 67 5KV APER200 x4500 by CMN	THIS TABLE LOOKS BEST WHEN VIEWED USING INTERNET EXPLORER. MAGNIFICATION FIGURES ARE FOR THE ORIGINAL SEMs, NOT FOR THE IMAGES YOU SEE ON YOUR COMPUTER SCREEN. I WILL BE ADDING SCALE BARS WHEN I HAVE TIME TO DO THE CALCULATIONS. Erionite or Offretite Detail of termination.
5-14-86 No. 104 5KV APER200 c. x450 by CMN	Heulandite growing around erionite or offretite Colorless. Rods, often bending, intergrown with heulandite. The tip of the upper left hand rod is seen below in SEM No. 108.
5-14-86 No. 108 5KV APER200 c x5000 by CMN	Erionite or offretite Colorless. Detail of termination of crystal seen above in SEM No. 104
4-2-86 No. 43 5KV APER200 x980 by CMN	Erionite or offretite with heulandite Colorless. Six sided rods beginning to form fibrous aggregtes; single huelandate crystal at lower left. Detail in SEM No. 44, below, comes from another part of this same cavity.
4-2-86 No. 44 5KV APER200 x9800 by CMN	Erionite or offretite Colorless. Detail of termination. Secondary growth of micro-rods wrapping onto adjacent crystal surfaces is common.
4-2-86 No. 48 5KV APER200 x105 by CMN	Erionite or offretite on heulandite druze Colorless. Rods have accumulated smaller, fibrous crystals (see detail, immediately below). Long fine rods have knobs of unidentified maineral (see SEM 47, below).
4-2-86 No. 48 5KV APER200 x105 by CMN	Erionite or offretite Details of fibrous accumulation.
4-2-86 No. 47 5KV APER200 x2420 by CMN	Erionite or offretite Colorless. Terminateion of long, very thin rod.