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Identity HelpIs this rhodonite with manganese?

5th Jan 2008 00:17 UTCRocky Barney

Hi...attached is a file of an orange pink stone that I find while digging plume agate near my home in central Utah. The plume is associated with an old manganese mine. Many times I have came across this bright colored mineral on the Manganese and have thrown them away. Are they Rhodonite, and if so are they worth collecting?

Rock

5th Jan 2008 01:27 UTCChester S. Lemanski, Jr.

Certainly looks like it is. Rhodonite often has black stripes, wisps and patches of black manganese oxides running through it.

5th Jan 2008 01:38 UTCGreg Dainty

Could be Rhodonite, thou it seems to have a high luster,not particularly common on massive rhodonite. Was the pce photographed wet?

Greg

5th Jan 2008 01:51 UTCJeremy Zolan

If it is Rhodonite, it is very much worth collecting. Especially if you provide an exact locality wit the specimens.

5th Jan 2008 02:05 UTCCraig Mercer

It's almost certainly Rhodonite, but I have to agree with Greg seems to have been oiled, wet or even lacquered....would be interested in seeing a photo without the luster.

Craig.

5th Jan 2008 02:59 UTCWayne Gilmore

Prolly not Rhodonite, way to red.Rhodocrocite is what it is me thinks.

5th Jan 2008 04:47 UTCRocky Barney

Yes the photo was taken wet...just after I cleaned it up...I am attaching another photo of it dry. The locality is NE of Glenwood Utah...If I can find out what it is, I will be posting it to Mindat...the piece measures 3" long 2 1/2" wide, and 1" thick.

Rock

5th Jan 2008 06:59 UTCJeremy Zolan

I think it is Rhodonite, but you can perform a simple test to see if it's Rhodochrosite. If you have any dilute hydrochloric acid (5%-30% is fine), place a drop of it on the surface of a piece and see if it effervesces (fizzes). If the hydrochloric acid reacts, you have a carbonate, which is likely Rhodochrosite. If the acid does not react or dissolve any of the rock, you likely have a silicate; likely to be Rhodonite.

You can buy hydrochloric acid labeled as muriatic acid in most hardware stores. However, be careful and do not get any of the acid on your skin or eyes (wear goggles and gloves when pouring the acid), and NEVER stand right above the container, the fumes are very irritating and dangerous. I just keep a little 30% solution in a 150mL dropper bottle for mineral tests, that's all I'll ever need for that kind of application.

5th Jan 2008 13:20 UTCRay Ladbury

Rocky, could it be Friedelite? In the picture it looks a little orange. Rhodonite or rhodochrosite are both possibilities. Jeremy's test is diagnostic for rhodochrosite. Otherwise, there are a plethora of possibilities--rhodonite, bustamite, pyroxmangite, nambulite, friedelite...

Are they worth collecting? Well, let me put it this way... Please, please please take me with you to collect them!!!

5th Jan 2008 15:05 UTCJeremy Zolan

If it is a silicate, you can test it using services provided by a few websites using X-Ray Diffraction (XRD) and other analytical processes. You can then easily determine the identification. I'm not going to make any assumptions until you perform the acid test. If it reacts, you know what you have! If it doesn't, well, it's time to perform an XRD or a similar test.

5th Jan 2008 16:49 UTCDonald Peck

I agree with Jeremy, but I would add that the crystals that appear on the right hand side of the specimen kind of support it being rhodonite.

5th Jan 2008 17:48 UTCRocky Barney

I tried the acid test this morning and SHAZAAM, it fizzed and started eating away the material. Does this mean Rhodocorosite?

Rock

5th Jan 2008 19:24 UTCRay Ladbury

If it fizzes, it's a carbonate, and given the evidence for manganese (red color + black streaks), that pretty much cinches rhodochrosite.

7th Jan 2008 15:05 UTCDonald Peck

Rocky, was it the pink material that fizzed, or surrounding material?

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