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Sainte Marie-aux-Mines Show 2018
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Roger Warin




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PostPosted: Jul 22, 2018 00:41    Post subject: Re: Sainte Marie-aux-Mines Show 2018  

And Paris Museums


120-Elbaite_20483_R.jpg
 Mineral: Elbaite
 Locality:
Pala District, San Diego County, California, USA
 Description:
 Viewed:  814 Time(s)

120-Elbaite_20483_R.jpg



121-Elbaite_20516_R.jpg
 Mineral: Elbaite
 Locality:
Jonas Mine, Itatiaia, Conselheiro Pena, Vale do Rio Doce, Minas Gerais, Brazil
 Description:
 Viewed:  810 Time(s)

121-Elbaite_20516_R.jpg



122-Elbaite_20533_R.jpg
 Mineral: Elbaite
 Locality:
Muiâne, Alto Ligonha District, Zambezia Province, Mozambique
 Description:
 Viewed:  810 Time(s)

122-Elbaite_20533_R.jpg



123-Hematite_20518_R.jpg
 Mineral: Hematite with Orthoclase (variety adularia)
 Description:
 Viewed:  810 Time(s)

123-Hematite_20518_R.jpg



124-Orpiment_20487_R.jpg
 Mineral: Orpiment
 Locality:
Jiepaiyu Mine (Shimen Mine), Shimen County, Changde Prefecture, Hunan, China
 Description:
 Viewed:  813 Time(s)

124-Orpiment_20487_R.jpg



125-Rhodochrosite_20515_R.jpg
 Mineral: Rhodochrosite
 Locality:
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province, South Africa
 Description:
 Viewed:  819 Time(s)

125-Rhodochrosite_20515_R.jpg



126-Topaze_20484_R.jpg
 Mineral: Topaz
 Locality:
Virgem da Lapa, Jequitinhonha, Minas Gerais, Brazil
 Description:
 Viewed:  813 Time(s)

126-Topaze_20484_R.jpg



127-Topaze_20514_R.jpg
 Mineral: Topaz
 Locality:
Murzinka Mine, Sarapulka District, Sverdlovskaya Oblast', Middle Urals, Urals Region, Russia
 Description:
 Viewed:  811 Time(s)

127-Topaze_20514_R.jpg



128-Wulfenite_20517_R.jpg
 Mineral: Wulfenite
 Locality:
Red Cloud Mine, Trigo Mts, Silver District, La Paz County, Arizona, USA
 Description:
 Viewed:  809 Time(s)

128-Wulfenite_20517_R.jpg


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Roger Warin




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PostPosted: Jul 23, 2018 00:46    Post subject: Re: Sainte Marie-aux-Mines Show 2018  

The vision of many gold nuggets saturates the eyes. At Sainte Marie, the monotony was broken by associating with the nugget a mineral whose general form was similar. This original idea was realized by the group Mineral & Gem. (MNHN Paris?).
The gold sample is thus highlighted by a remarkable mineral.
Not only are the shapes similar but, for contrast, the colors are complementary. Of course the color of gold is green in transmitted light.
The most breathtaking association is that of gold pseudomorphoses after pyrite compared with malachite on Chessy pyrite.

Octahedron showing a hollow-faced skeletal growth, this type is common to Chessy, and still has a complete pseudomorphose malachite.

In the same way, gold concentrated on the edges of the growing pyrite crystal at Bodaybo (Russia). Alteration dissolves pyrite. It remains the skeletal form where the gold was deposited.
It may be this comparison that gave the idea to the curator to present gold and a mineral.

In 2016, I had already seen several pseudomorphoses of gold after pyrite at Sainte Marie.



129-Or_20491_R.jpg
 Mineral: Gold
 Locality:
Round Mountain Mine, Round Mountain, Round Mountain District, Nye County, Nevada, USA
 Description:
with Pyromorphite, Chaillac F.
 Viewed:  684 Time(s)

129-Or_20491_R.jpg



130-Or_20493_R.jpg
 Mineral: Gold
 Locality:
Round Mountain Mine, Round Mountain, Round Mountain District, Nye County, Nevada, USA
 Description:
With pyromorphite, Les Farges, F.
 Viewed:  683 Time(s)

130-Or_20493_R.jpg



131-Or_20494_R.jpg
 Mineral: Gold
 Locality:
Mato Grosso, Brazil
 Description:
with Pyromorphite, Les Farges, F.
 Viewed:  683 Time(s)

131-Or_20494_R.jpg



132-Or_20499_R.jpg
 Mineral: Gold
 Locality:
Colorado Quartz Mine, Colorado, Colorado District, Mother Lode Belt, Mariposa County, California, USA
 Description:
with Pyromorphite
 Viewed:  687 Time(s)

132-Or_20499_R.jpg



133-Or_Bournon_20498_R.jpg
 Mineral: Gold
 Locality:
Santa Elena de Uairén, Gran Sabana, Bolívar State, Venezuela
 Description:
with Bournonite, La Mure, F.
 Viewed:  684 Time(s)

133-Or_Bournon_20498_R.jpg



134-Or_Qtz_20492_R.jpg
 Mineral: Gold
 Locality:
Golden Rule Mine, Jumper & Golden Rule Group, Jamestown Mine (Jamestown Group), Jamestown, Jamestown District, Tuolumne County, California, USA
 Description:
with quartz, La Gardette, F.
 Viewed:  683 Time(s)

134-Or_Qtz_20492_R.jpg



135-Or_Sph_20493_R.jpg
 Mineral: Gold
 Locality:
Round Mountain Mine, Round Mountain, Round Mountain District, Nye County, Nevada, USA
 Description:
with Sphalerite, dolomite, La Mure, F.
 Viewed:  684 Time(s)

135-Or_Sph_20493_R.jpg



136-Pseudo-pyrite_20490_R.jpg
 Mineral: Gold
 Description:
Bodaybo, Russia
Pseudo-or with pseudo-malachite, Chessy, F.
 Viewed:  684 Time(s)

136-Pseudo-pyrite_20490_R.jpg



137-Gold_20291_bis_R.jpg
 Mineral: Gold
 Description:
Bodaybao Russia
Seen in 2016
see comment
 Viewed:  686 Time(s)

137-Gold_20291_bis_R.jpg


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Roger Warin




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PostPosted: Jul 26, 2018 09:44    Post subject: Re: Sainte Marie-aux-Mines Show 2018  

My visit to the Sainte-Marie Show always ends with the visit of Alsatian wine cellars.
This sphere set with corks has a false symmetry, induced by ethyl alcohol.
My reports always end with the smile of this pretty Alsatian carved in the wood and presented on the screw of a press of bunches of grapes.
And finally, a stork on the top of a chapel. Life is sweet in Alsace.



100-Sym_bouchons_20588_R.jpg
 Description:
Corks
Alsace
 Viewed:  529 Time(s)

100-Sym_bouchons_20588_R.jpg



101-Vigneronne_20583_R.jpg
 Mineral: Vigneronne
 Description:
Wine grower
 Viewed:  529 Time(s)

101-Vigneronne_20583_R.jpg



102-Cigogne_20620_R.jpg
 Mineral: Stork
 Description:
Peace
 Viewed:  530 Time(s)

102-Cigogne_20620_R.jpg


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Gagat Minerals




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PostPosted: Aug 06, 2018 02:37    Post subject: Re: Sainte Marie-aux-Mines Show 2018  

Roger Warin wrote:
... Of course the color of gold is green in transmitted light.
...


- I beg your pardon???
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PostPosted: Aug 06, 2018 07:50    Post subject: Re: Sainte Marie-aux-Mines Show 2018  

Hi,
I think you were surprised by what I said. The lure of gold has been the downfall of many people.
Explaining the color of minerals is a difficult task without resorting to difficult theories for the amateur. This is certainly also the case for metals. Why is silver white like polished silver and why is gold yellow and copper red?
It all depends on the efficiency of the absorption of the light beam and its re-emission by reflection. Silver reflects light well according to all the wavelengths that compose it.
If there is an increase in the energy level, the efficiency of absorption decreases, as is the case for gold and copper. The reflectivity is reduced to the blue-green end of the spectrum and the metal appears yellow (gold) or reddish (copper). Gold and copper have low reflectivity at short wavelengths, and are preferentially reflected.
Gold can be beaten into gold leaf less than 100 nm thick, revealing a bluish-green color when light is transmitted through it. Gold is yellow, but not blue-green.
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Gagat Minerals




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PostPosted: Aug 06, 2018 16:34    Post subject: Re: Sainte Marie-aux-Mines Show 2018  

Roger Warin wrote:

Gold can be beaten into gold leaf less than 100 nm thick, revealing a bluish-green color when light is transmitted through it. Gold is yellow, but not blue-green.


- so please in the future let us know that this is about extremely rare situation (not exactly from this world) because in our reality - gold is ore mineral, not translucent at all (so opaque microscopy is common methode to observe it).
regards
K.Andrzejewski
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