UNIDENTIFIED MINERALS, ROCK ISLAND DAM, DOUGLAS COUNTY, WA

4-9-86 No. 51 5KV APER200 x2000 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.


Unknown mineral on Heulandite

    Colorless. Rosettes composed of polygonal plates of interlocking fiberous crystals which dgrow in interlocking clusters and as continuous cavity linings. Sometimes intergrown with erionite or offretite.

4-9-86 No. 50 5KV APER200 c. x5000 by CMN
Unidentified mineral on heulandite (?)

    Same specimen as seen in SEM no. 51.

5-21-86 No. 119 5KV APER200 c. x2000 by CMN
Unidentified mineral growing on offretite (?)

    Yellow-brown. Slightly translucent spheres on offretite (?).

5-21-86 No. 120 5KV APER200 c x500 by CMN
Unidentified mineral on Offretite (?)

    Translucent red-brown. Shperes growing of fine rods of offretite or erionite growing from a druze of heulandite

10-10-85 No. 3 5KV APER200 c x1800 by CMN
Unidentified mineral on Offretite (?)

    Yellow-brown. Shperes with coral-like structure growing on fine rods of offretite (?) growing from a druze of heulandite. The setting for this mineral is seen in SEM nos. 40, 41 and 42, below.

4-2-86 No. 41 5KV APER200 c x475 by CMN
As above, showing the spheres both on rods and on heulanndite crystals.

4-2-86 No. 41 5KV APER200 c x475 by CMN
Enlargement of a portion of SEM no. 41 showing a lattice of small unidentified crystals twining around a rod of offretite (?).

4-2-86 No. 42 5KV APER200 c x475 by CMN
As above, showing the attachment foot of spheres which have been borken free of heulandite crystals. Select the picture to see these clearly.

4-2-86 No. 120 5KV APER200 c x95 by CMN
General contest for the series above.