HEULANDITE, ROCK ISLAND DAM, DOUGLAS COUNTY, WA
5-21-86 No. 114 5KV APER200 x500 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. Heulandite     Colorless. Sometimes intergrown, thick plates with the typical coffin-top terminations. Same cluster appears from a different angle in SEM no. 60, below.
4-9-86 No. 60 5KV APER200 c. x302 by CMN	Heulandite and erionite or offretite     Colorless. Thick plates of heulandite intergrown with each other.
4-9-86 No. 60 5KV APER200 c. x302 by CMN	Heulandite     Enlargement of cluster seen above.
4-9-86 No. 66 5KV APER200 c. x1860 by CMN	Heulandite     Colorless. Borad, coffin-shaped terminations exhibiting restricted growth patterns possibly created when crystals fail to form interprentration twins. White lines possibly erionite or offretite rods growing on crystal surfaces.
5-21-86 No. 117 5KV APER200 c. x450 by CMN	Heulandite growing around erionite or offretite     Colorless. Thick plates of heulandite intergrown with each other and rods of erionite or offretite.
4-2-86 No. 45 5KV APER200 c x244 by CMN	Heulandite druze     Colorless. Druze of the blocky heulandite crystals typical of Rock Island.