Montebrasite is a lesser known analogue of Amblygonite, but it turns out that a large percentage of the material that has been labeled as Amblygonite over the decades is more than likely Montebrasite. Apparently, Montebrasite is the hydroxyl (OH) member of the series, and is FAR more common than Amblygonite which is the fluorine analogue. A number of tests have revealed that the vast majority of the "Amblygonites" in the world are Montebrasite, so keep this in mind when you see the material offered for sale.
This would be a very good sized stone of Montebrasite on its own, but it is actually the host for the rare lead antimony sulfosalt Boulangerite which is seen as thin gray "needles" included inside. I've never seen the association before, so I was certainly surprised when I laid eyes upon it. This stone was analyzed by Dr. Jaroslav Hyrsl, who confirmed that the "needles" were in fact Boulangerite. An exceptionally rare and unusual gem for anybody who likes inclusion stones or just oddball pieces.
Locality: Brazil
Weight: 21.55 cts
Size: 18.13 x 13.49 mm
Cut: Emerald
Color: Colorless and Gray
Clarity: Slightly Included to Translucent
Shipping from United States
Processing time
1-3 business days
Estimated shipping times
- North America : 2 - 5 business days
- Europe : 7 - 14 business days
- Australia, New Zealand and Oceania : 10 - 20 business days
- Asia Pacific : 7 - 14 business days
I'll do my best to meet these shipping estimates, but can't guarantee them. Actual delivery time will depend on the shipping method you choose.
Customs and import taxes
Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.
Payment Options
Returns & Exchanges
I gladly accept returns, exchanges, and cancellations
Just contact me within: 14 days of delivery
Ship items back to me within: 30 days of delivery
Request a cancellation within: 2 days of purchase
But please contact me if you have any problems with your order.
The following items can't be returned or exchanged
Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:
- Custom or personalized orders
Conditions of return
Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.
Questions about your order?
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