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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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 Posted: Dec 22, 2014 10:05 Post subject: Re: Bob's rocks |
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Hi Bob. Nice specimens and, especially the last few photos, very nice pictures.
_________________
Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Dec 22, 2014 10:20 Post subject: Re: Bob's rocks |
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Pierre, Tobi and Vitaliy,
Thanks for the kind words.
BTW, I spent 10 years and about 80 days at Kern Knob (my Master's thesis project) and except for a few thumbnails and one miniature, this Amazonite is the best I was able to find.
Bob
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Dec 25, 2014 22:30 Post subject: Bob's rocks - Fluorites |
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Here are a few fluorites....
| Mineral: | Fluorite |
| Locality: | | Xianghualing Mine, Xianghualing Sn-polymetallic ore field, Linwu, Chenzhou Prefecture, Hunan Province, China |  |
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| Dimensions: | 130.0 x 80.0 x 40.0 mm |
| Description: |
| Several, individual, well-separated cubes of glassy, pale-green Fluorite to 33 x 32 x 24 mm, with pale frosted phantoms at their edges, are perched on contrasting dark matrix accented with small sparkling cubes of pale Fluorite. The specimen is in perfect condition. |
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24650 Time(s) |
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| Mineral: | Fluorite on Quartz |
| Locality: | | Ruyuan Fluorite Mine, Ruyuan, Shaoguan Prefecture, Guangdong Province, China | |
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| Dimensions: | 123.0 x 115.0 x 37.0 mm |
| Description: |
| Lustrous, translucent, apple-green Fluorites to 40 x 35 mm are perched on a bed of fine white to clear, etched Quartz points. In perfect condition. |
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24625 Time(s) |
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| Mineral: | Fluorite on Quartz |
| Locality: | | Xiefang Mine, Ruijin, Ganzhou Prefecture, Jiangxi Province, China | |
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| Dimensions: | 81.0 x 80.0 x 50.0 mm |
| Description: |
| A lustrous, complexly-crystallized, cuboctahedral crystal of apple-green Fluorite measuring 61 x 56 x 40 mm, with stepped faces, is perched on a matrix of lustrous, white Quartz points to 3 mm, with sugary Quartz overgrowths. This is a top specimen with no damage. |
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24623 Time(s) |
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Dec 26, 2014 00:51 Post subject: Re: Bob's rocks |
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Wow Bob, the last 2 specimens are very similar to some Brandberg prehnites! Lovely specimens.
_________________
Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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| Posted: Dec 26, 2014 12:32 Post subject: Re: Bob's rocks |
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| Bob, that Xianghualing specimen is a killer, I really like it!
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Dec 26, 2014 12:49 Post subject: Re: Bob's rocks |
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Thanks.
Tobi, the Xianghualing piece is even more transparent in person, as are all these fluorites. That is a hard thing for me to capture in photos. But, I keep trying!
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Dec 29, 2014 11:59 Post subject: Bob's rocks - Baryte from Xikuangshan |
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Just finished cleaning this piece - acquired it in Tucson in February.
I am posting the completed specimen, and will show a few intermediate cleaning steps, for those interested. The specimen was in great condition when purchased, but had lots of distracting iron stains. It was washed in water, then soaked in Super Iron Out, then soaked in water. Lastly, I had a friend soak it in diluted and silicified HF for a few hours to remove a whitish Quartz film from the Baryte.
These photos also illustrate the difference in color using different light sources. With daylight balanced (6500K) lights, the Barytes have a slight yellowish color as seen in the first photo. All the intermediate photos were taken with a cheap handheld camera using flash and automatic white balance.
| Mineral: | Barite |
| Locality: | | Xikuangshan Sb deposit, Lengshuijiang, Loudi Prefecture, Hunan Province, China | |
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| Dimensions: | 117 x 110 x 78 mm |
| Description: |
| Lustrous, translucent, blocky crystals of greyish Baryte with a yellowish tinge, to 56 x 41 x 19 mm, are perched on a plate of lustrous, clear Quartz points with minor iron staining. This is a fine Baryte with no damage. |
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27557 Time(s) |
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| Mineral: | Barite |
| Locality: | | Xikuangshan Sb deposit, Lengshuijiang, Loudi Prefecture, Hunan Province, China | |
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| Dimensions: | 117 x 110 x 78 mm |
| Description: |
| Just water washed -- before any chemical cleaning. |
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27571 Time(s) |
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| Mineral: | Barite |
| Locality: | | Xikuangshan Sb deposit, Lengshuijiang, Loudi Prefecture, Hunan Province, China | |
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| Dimensions: | 117 x 110 x 78 mm |
| Description: |
| Just taken out of rinse water following 24 hours in Super Iron-Out (Sodium metabisulfite). After this step, there was a whitish Quartz film on the sides of the Baryte removed by a diluted solution of HF (don't try at home!), to yield the final specimen. |
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27619 Time(s) |
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Carles Millan
Site Admin
Joined: 05 May 2007
Posts: 1537
Location: Catalonia
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| Posted: Dec 29, 2014 13:49 Post subject: Re: Bob's rocks - Baryte from Xikuangshan |
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| GneissWare wrote: | | Just finished cleaning this piece - acquired it in Tucson in February. |
Good job, Bob! And a fine specimen too.
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Don Lum
Joined: 03 Sep 2012
Posts: 2919
Location: Arkansas
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| Posted: Dec 29, 2014 14:35 Post subject: Re: Bob's rocks |
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Beautiful specimen, Bob. Thanks for taking us through the cleaning process and comments on your photography.
Don
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hogwild |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4248
Location: Germany
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| Posted: Dec 29, 2014 15:23 Post subject: Re: Bob's rocks |
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Great specimen ✓
Great job of cleaning ✓
Great photo (the first one) ✓
_____________
= Simply great, Bob ;-)
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Dec 29, 2014 16:30 Post subject: Re: Bob's rocks |
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Thanks all.
I have a few other project rocks I will post when I get them done, along with a similar explanation of cleaning techniques.
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Jan 03, 2015 11:55 Post subject: Bob's rocks - Fluorapatite from Broken Hill |
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Presented here is an nice DT apatite from Australia. It was embedded in the matrix originally, and was air scribed to better reveal the crystal.
| Mineral: | Fluorapatite on Calcite |
| Locality: | | Broken Hill, Yancowinna County, New South Wales, Australia | |
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| Dimensions: | 83 x 65 x 53 mm |
| Description: |
| A 69 x 11 x 9 mm Fluorapatite crystal is set in matrix on this very fine and aesthetic specimen from Broken Hill. The pristine, doubly-terminated, greyish-green hexagonal crystal is opaque and has fine waxy luster. Specimens of this quality are very uncommon from Broken Hill. |
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| Viewed: |
27315 Time(s) |
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| Mineral: | Fluorapatite on Calcite |
| Locality: | | Broken Hill, Yancowinna County, New South Wales, Australia | |
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| Dimensions: | 83 x 65 x 53 mm |
| Description: |
| Before cleaning and trimming |
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| Viewed: |
27338 Time(s) |
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: Jan 04, 2015 03:04 Post subject: Bob's rocks - Mushistonite on Kesterite on Cassiterite from Xuebaoding |
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A bit of an oddity, I think...
| Mineral: | Mushistonite on Kesterite on Cassiterite |
| Locality: | | Mount Xuebaoding, Pingwu, Mianyang Prefecture, Sichuan Province, China | |
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| Dimensions: | 73 x 50 x 40 mm |
| Description: |
| A lustrous, black crystal of Cassiterite, measuring 35 x 35 mm, is mostly overgrown with blocky crystals of Kesterite to 9 mm long, completely coated with apple-green Mushistonite. Some of the Mushistonite was removed to reveal the Cassiterite, and small patches of fibrous, green Malachite(?) also accent the crystal. The Cassiterite is perched on a bed of silvery Muscovite blades. This is one of the most unique associations I have seen from the famous Xuebaoding deposit, and is is excellent condition. |
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27311 Time(s) |
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Carles Millan
Site Admin
Joined: 05 May 2007
Posts: 1537
Location: Catalonia
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| Posted: Jan 04, 2015 04:57 Post subject: Re: Bob's rocks - Mushistonite on Kesterite on Cassiterite from Xuebaoding |
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| GneissWare wrote: | | A bit of an oddity, I think... |
Must be a really unusual combination. I had never seen it before. An excellent specimen, Bob. But it should be labeled as mushistonite on kesterite on cassiterite on muscovite on a granitic rock :-)
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Don Lum
Joined: 03 Sep 2012
Posts: 2919
Location: Arkansas
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| Posted: Jan 04, 2015 12:06 Post subject: Re: Bob's rocks |
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Great specimen, Bob. What a combination.
_________________
hogwild |
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