We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
28 Mar-18:25:15 Re: collection of firmo espinar (Firmo Espinar)
28 Mar-09:37:50 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-19:47:08 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Pete Richards)
27 Mar-16:15:44 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-15:18:59 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Alfredo)
27 Mar-14:39:29 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-05:21:48 Re: the mim museum in beirut, lebanon (Mim Museum)
27 Mar-05:03:26 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
27 Mar-02:39:50 Re: the mim museum in beirut, lebanon (Tobi)
27 Mar-00:23:28 Re: collection of volkmar stingl (Volkmar Stingl)
26 Mar-00:53:41 Re: collection of volkmar stingl (Volkmar Stingl)
25 Mar-13:32:10 Re: collection of michael shaw (Michael Shaw)
25 Mar-00:25:58 The mizunaka collection - quartz (Am Mizunaka)
23 Mar-13:35:22 Re: collection of firmo espinar (Firmo Espinar)
22 Mar-08:32:28 Re: collection of michael shaw (Michael Shaw)
22 Mar-04:20:41 Re: the mim museum in beirut, lebanon (Mim Museum)
21 Mar-22:49:19 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:47:40 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:45:25 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-15:34:23 Re: the mizunaka collection - quartz (Am Mizunaka)
21 Mar-14:35:08 Re: jim’s mineral collection (Jim Wilkinson)
21 Mar-14:15:36 The 4th phoenix heritage mineral show (phms) hosted by mineralogical society of arizona (m (Chris Whitney-smith)
21 Mar-04:36:10 Re: the mizunaka collection (Tobi)
21 Mar-04:11:47 Re: jim’s mineral collection (James Catmur)
20 Mar-23:34:15 The mizunaka collection - quartz (Am Mizunaka)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
111804


The time now is Mar 28, 2024 18:31

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Merelaniite - a new mineral from the famous tanzanite deposit
  
  Index -> Minerals and Mineralogy
Like
22


View previous topic :: View next topic  
Author Message

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 05, 2016 13:03    Post subject: Merelaniite - a new mineral from the famous tanzanite deposit  

Following keen observations by Jessica Simonoff, Robert Simonoff, and Mike Wise of unusual black whiskers associated with other minerals from the tanzanite mines near Merelani, Tanzania, Jessica and Mike published their observations in Mineral News in 2012, with a preliminary identification of the whiskers as molybdenite. Subsequent investigations of these whiskers, which form scroll-like structures similar to cylindrite, showed that they were indeed a cylindrite-group mineral with alternating layers of MoS2 and PbS rich chemistry. The new mineral (IMA 2016-042) is called merelaniite, after the locality and in honor of the miners who work there. For more information see the open access article in Minerals:
https://www.mdpi.com/2075-163X/6/4/115



705-10_med.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 0.73 mm
 Description:
0.73-mm cylindrical whisker associated with Tremolite and Prehnite.http://www.mdpi.com/2075-163X/6/4/115
 Viewed:  16308 Time(s)

705-10_med.jpg



711-05.jpg
 Mineral: Merelaniite in Quartz
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 2.8 cm tall
 Description:
Merelaniite whiskers in quartz, associated with chabazite. A. E. Seaman Mineral Museum specimen. ex Simon Harrison. http://www.mdpi.com/2075-163X/6/4/115
 Viewed:  16303 Time(s)

711-05.jpg



Fig.13.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: ~5 nm scale bar
 Description:
High Resolution Transmission Electron Microscope image of a fragment of merelaniite showing the alternating layers (along the radial direction of the cylindrical whisker).http(:)//www(.)mdpi(.)com/2075-163X/6/4/115
 Viewed:  16332 Time(s)

Fig.13.jpg



_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
7
   

Jordi Fabre
Overall coordinator of the Forum



Joined: 07 Aug 2006
Posts: 4888
Location: Barcelona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 05, 2016 13:21    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Warmest congratulations John!
Back to top
Reply to topic Reply with quote
Like
1
   

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 05, 2016 21:34    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Scanning electron microscope image of a merelaniite whisker showing the termination and also some variation in the diameter (about 24 microns maximum). (Piece of the holotype specimen.)


624c-05.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 24 microns max diameter
 Description:
Merelaniite whisker found in a crevice of a large alabandite crystal.
 Viewed:  16174 Time(s)

624c-05.jpg



_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
3
   

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 07, 2016 16:03    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

SEM image of a 12-micron diameter broken whisker revealing the coiled nature of its layered structure.


622-10.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 12-micron diameter
 Description:
Broken merelaniite structure showing its layered texture.
 Viewed:  15916 Time(s)

622-10.jpg



_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
1
   

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 10, 2016 14:51    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Very interesting and unusually large merelaniite whisker that has some layers naturally unwound and encased in calcite (white). The overall whisker is about 5 mm long.


705-07_med.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 5 mm (largest whisker)
 Description:
Merelaniite with calcite and prehnite.
 Viewed:  15801 Time(s)

705-07_med.jpg



_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
5
   

Roger Warin




Joined: 23 Jan 2013
Posts: 1171


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 11, 2016 05:47    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Merelianiite
Thank you for this beautiful info. There are no limits to the mineral world.
Just open the eyes of the new machines.
The Malagasy deposits are also full of hope.
Roger.
Back to top
Reply to topic Reply with quote
Like
1
   

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 13, 2016 17:02    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Close up of the above specimen showing the partly-exposed whisker of merelaniite.


705-04_HFB.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 1.43-mm wide field of view
 Description:
close up showing naturally "unwound" layers partly encased in clear calcite.
 Viewed:  15632 Time(s)

705-04_HFB.jpg



_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
3
   

John S. White
Site Admin



Joined: 04 Sep 2006
Posts: 1295
Location: Stewartstown, Pennsylvania, USA


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 13, 2016 20:58    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

So what is the composition of merelaniite?
_________________
John S. White
aka Rondinaire
Back to top
Reply to topic Reply with quote
Like
   

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 13, 2016 22:42    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Hi John
The microprobe analyses give
Mo4.33 Pb4.00 As0.10 V0.86 Sb0.43 Bi0.33 Mn0.05 W0.05 Cu0.03 (S14.70 Se0.30)_Sum=15

or more simply, Mo4 Pb4 V Sb S15
but it is an incommensurate structure so this is just approximate. There is also an As rich variety that at least for now, we don't believe is a new species, but more work needs to be done.

_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
   

John Jaszczak




Joined: 05 Oct 2010
Posts: 300
Location: Hancock, MI


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 26, 2016 13:30    Post subject: Re: Merelaniite - a new mineral from the famous tanzanite deposit  

Merelaniite whisker showing pronounced variation along its axis of its diameter. Partially protruding from calcite.


705-03_med.jpg
 Mineral: Merelaniite
 Locality:
Merelani mines, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania
 Dimensions: 0.9 mm
 Description:
whisker of merelaniite with calcite (and prehnite, not shown)
 Viewed:  15324 Time(s)

705-03_med.jpg



_________________
Adjunct Curator, A. E. Seaman Mineral Museum
Professor of Physics
Michigan Technological University
Back to top
Reply to topic Reply with quote
Like
1
   
Display posts from previous:   
   Index -> Minerals and Mineralogy   All times are GMT - 5 Hours
Page 1 of 1
    

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2024


Powered by FMF