Epistolite : Na2(Nb,Ti)2(Si2O7)O2·nH2O, Raite : Na4Mn2+3Ti0.25Si8O20(OH)2·10H2O

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minID: MPY-A0D

Epistolite : Na2(Nb,Ti)2(Si2O7)O2·nH2O, Raite : Na4Mn2+3Ti0.25Si8O20(OH)2·10H2O

This image has been released to the public domain and may be used freely.
Dimensions: 13 cm x 10 cm x 6 cm
Field of View: 3.8 mm
Largest Crystal Size: 2 mm
Weight: 740 g

Perfect, thin platy, free growing, crystals of epistolite with acicular raite. The epistolite spans about 2.3 mm; raite crystals to about 0.6 mm. The yellowish crystal at the bottom is sérandite.

Free growing epistolite crystals are rare at MSH - or anywhere else for that matter. They do occur at the near-by Demix-Varennes quarry. Compare with MinId DA4=5DD [http://www.mindat.org/photo-163589.html] which is from a find confirmed via XRD, microprobe, etc. at three different labs.

The raite from this find was confirmed via microprobe at the CMN. Raite is orthorhombic and these crystals are robust enough so that the squarish cross-sections can be discrened at high magnification.

The epistolite sits in a small cavity in a rather large (13 x 10 x 6 cm) specimen very rich in raite and (unusual for MSH) prismatic gmelinite-Na. (See the “related’ photos.) The epistolite was overlooked for many years because it isn’t obvious unless the light hits it just so.

This photo has been shown 157 times
Photo added:3rd Aug 2016
Dimensions:5111x3298px (16.86 megapixels)
Date/Time of Photo:3rd Aug 2016 15:43:05
Camera:CANON EOS 100D / Rebel SL1 / Kiss X7
Exposure time:1/1s
ISO speed:200

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