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.