Pectolite : NaCa2Si3O8(OH)

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minID: 70K-55C

Pectolite : NaCa2Si3O8(OH)

This image has been released to the public domain and may be used freely.

Size ~ 1½ x 2½ x 1 cm. Found late 1990s. MOB coll.

This looks a lot like makatite both from MSH and the Saint-Amable Sill. It ain’t – but you can see why many MSH specimens (especially ones from breccia such as this one) get labeled as makatite.

The major distinguishing feature is the fluorescence. While not all makatite fluoreseces, when it does it is moderate to strong blueish white or very pale greenish SW (and sometimes LW as well). This specimen fluoresces a weak pinkish LW – typical of MSH pectolite.

Used to be, any MSH “makatite” not from soadalite xenolith was automatically suspect. But it has apparently now been found in pegmatites. In addition http://www.mindat.org/photo-449515.html – which see for details – appears to be from a marble xenolith. If it’s not from one of these environments – caveat emptor. Check the fluorescence. It may not be 100% reliable but if it has strong non-pink response SW it’s likely makatite. Of course there are also other differences – but they can be hard to spot even with a scope.

In the case of this specimen, it is from an igneous breccia and very similar material was (visually) ID as pectolite by a mineralogist very familiar with MSH. It also fluoresces pink/violet.

There is a stereo child photo.

This photo has been shown 439 times
Photo added:7th Mar 2012
Dimensions:814x1024px (0.83 megapixels)
Software:Adobe Photoshop CS3 Windows

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