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GeneralChocolate Heulandite on Green Heulandite

31st Mar 2006 20:46 UTCBrander Robinson

I have a 9cm x 7cm green heulandite with a 4cm x 4cm chocolate colored heulandite. I showed this specimen to several noteworthy Indian dealers at Tucson this year. None of the dealers had seen this color before(chocolate). One dealer "thought" he had seen some a few years ago. This color is not like the deep reddish color seen this year at Tucson. Can anyone help me in trying to find any more info on this specimen. I have had it about 5-6 years and was told it was from Sakur Aurangabad, India. See attached pic. Thanks Brander Robinson Pearce, Arizona

31st Mar 2006 20:52 UTCUwe Kolitsch Manager

The chocolate colour may be due to hematite inclusions.

1st Apr 2006 03:48 UTCBrander Robinson

Thanks Uwe-One dealer said it could Manganese inclusions. Brander

1st Apr 2006 18:55 UTCRobert Knox

Hi Brander, quite a lovely specimen you've got! The heulandites of the Indian Deccan traps are some of my personal favorites. I believe your specimen originates from the area around Shakur where brown, green, and even a yellow heulandite are found in association with each other. Read Mineralogical Record 2003, vol34 #1, by Berthold Ottens. I have a brown heulandite from another location, Jalgaon, that is smaller(3-4 cm.), and is in truth a gemmy pink with the brown being a final "coating" in association with pink stilbite, apophyllite, on a base of gemmy gray chalcedony. These are the only locals for brown heulandites I know of in India. Keep in mind that this huge geological formation will continue to provide new occurances of all the zeolites and their associates in the future. Heulandites of differing colors and habits will be amoung them. I hope this helps,

Bob

3rd Apr 2006 23:53 UTCBrander Robinson

Hi Bob-Thanks so much for the info. The brown color is like I had never seen before especially in combination with the green on the same specimen. I have one other specimen that is about the same size. I was concerned that someone had dyed it this odd brown color. I hear okenite is being dyed green and sold as natural by the Chinese(and others). Any ideas on the trace mineral-manganese?

Thanks again. brander

4th Apr 2006 21:24 UTCRobert Knox

Hi Brander...looks like we have this thread all to ourselves. The question of mineral coloring agents in the deccan trap heulandites seems to be ongoing and inconclusive with the exception of celadonite. I've read proposals that hematite or gotheite could be responsible, but I'm not aware of any diffinitive studies compleated. Because celadonite is made of, amoung otherthings, iron and magnesium, one could presume that other mineral forms of either of these two elements could be responsible. Of possible intrest is that the celadonite is infused in quartz/chalcedony, and that it is the inclusion material.

I'm hopeing that another contributor here at mindat, the knowledgable Rock Currier, could infrom us of any recent developments in this area. I also am in occasional contact with another expert in this field, K.C. Panday, who I hope to be seeing in at the Costa Mesa show in May. As both the esteemed Mr. Currier and Mr. Panday should be there, I will try to accuire new info from them and post it to this thread.

All the best, Bob

29th Dec 2006 16:59 UTCBrander Robinson

Hi Bob,

Was wondering if you found anything new from your friends at the Costa Mesa Show on the heulandite. I will have the specimen at #169 Inn Suites in Tucson 2007. I also posted a picture of it on my gallery here on Mindat so others may comment. Brander

29th Dec 2006 19:56 UTCRobert Knox

Hi Brander, no, I wasn't able to go to the Costa mesa show this year. Maybe 2007 will better allow me to attend. I wish I could be at Tuscon in February...so much to see and so much more to learn about. I hope you have a great time.

Bob

29th Dec 2006 20:00 UTCBrander Robinson

Hi Bob,

Sorry you can not get to Tucson. Thanks for all your input-will keep you informed. Brander

29th Dec 2006 20:21 UTCAlfonso Rodriguez Ruiz Expert

Hi Brander, I have another chocolate heulandite, although the matrix is not green heulandite. It is a very rare and difficult to find this type of heulandite. Your specimen is very good. Congratulations!!

Best regards, Alfonso

30th Dec 2006 01:05 UTCBrander Robinson

Hi Alfonso,

Thank you for the reply. Where is your specimen from and could you send a picture? You can reply to my email that is on the mindat directory if you would like. Keep in touch. Brander

10th Jun 2007 02:00 UTCRock Currier Expert

Brander,

Since my name has been mentioned in this thread I thought I might respond with some general observations. I have not been to India for a number of years nor do I know about the cause of the colorations in the "green" heulandites. The first of the green heulandites I saw were found on the surface of the hills near Pashan which is a little community near Pune that had the little valley with quarries around is perimeter that produced many fine specimens of green apophyllite. I never paid any attention to them because I considered them to be sort of weathered rubbish specimens. A few years later I saw them with some of the Indian dealers with high prices, and apparently getting them. Well, they were smarter than I was, that's for sure. All of the green/dark brown apophyllite specimens I have seen, and the one you have pictured look like they have been weathered a little and I suspect that they have all been found on or near the surface in weathered areas of the basalt. I have also observed the heulandites seem to concentrate any available iron much better than the other zeolites (I include apophyllite, stibnite, gyrolite, okenite etc. here). Many times, I have seen pockets containing several zeolites including heulandite and only the heulandite has any color at all, usually ranging from a pale pink to a dark reddish brown. I am not sure it is iron that is coloring the heulandites pink, red and dark reddish brown. That is just speculation on my part. One thing is for sure. Zeolite and related minerals will be produced in great abundance from the Deccan traps as long as there are large numbers of people living there and that there will be enough to supply specimens of these minerals to every man woman and child on the planet should they want one.

Rock

10th Jun 2007 18:46 UTCRoy Wood

Hi,

I have seen a couple chocolate heulandites on eBay and watch for one to add to my zeolite collection but chocolate on green is really an odd occurance. You have a lucky find.

Roy

15th Jun 2007 19:43 UTCBrander Robinson

Rock and Roy,

Thank you both for the information on the heauandite. Hopefully others will comment also. Thanks again to you both(Rock and Roy). Brander

12th Sep 2017 18:25 UTCBrander Robinson

Thought I would see if any chocolate heulandite on green heulandite has been reported since my last post on the subject in 2007. There were varying opinions including dye being used. Any responses would be appreciated.

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