- 61
superbe collection de minéraux fluorescents
Estimate
20,000 - 25,000 EUR
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Description
- Dim. de la boîte : haut. 61 cm ; larg. 105 cm ; prof. 57 cm
Toute la beauté des roches fluorescentes réside dans cette collection de roches dont l'intérêt est d'émettre des lumières colorées dans l'obscurité. Ces roches ont de tout temps été des objets de collection et même d'usage dans certains travaux lapidaires. On raconte ainsi qu'aux environs de l'an 1000 existait chez l'Empereur de Chine, un tableau magique sur lequel un boeuf apparaissait chaque soir. Ce fut le premier exemple, dans l'histoire, d'un matériau fabriqué par l'homme, capable d'émettre de la lumière luminescente. En dépit donc de la grande beauté naturelle des minéraux, il y eut une autre sorte de beauté recherchée par les collectionneurs de minéraux et qui réside dans la capacité du minéral à émettre des lumières colorées dans l'obscurité. D'un point de vue scientifique, les minerais fluorescents sont des minerais qui émettent une lumière colorée visible une fois activés par lumière UV, les rayons X et les faisceaux d'électrons invisibles. Certains électrons dans le minerai absorbent l'énergie de ces derniers et accèdent à un état de plus haute énergie encore qui se singularise par l'émission même de ces lumières colorées.
Quelle est la cause de la fluorescence?
Certains minéraux sont donc fluorescents quand ils sont soumis à une source de lumière ultraviolette. Le phénomène est soit une propriété intrinsèque du minéral, soit lié à la présence d'impuretés que l'on nomme des activateurs et des co-activateurs de fluorescence. Dans le premier cas, la fluorescence est pratiquement constante quelque soit la localisation du minéral alors que dans le second cas la fluorescence sera rendue aléatoire puisque liée à la présence ou non de ces substances. Ceci explique pourquoi une Calcite par exemple sera fluorescente en rouge alors qu'une autre sera fluorescente en bleu. Sachez aussi qu'il existe des inactivateurs de fluorescence qui ont quant à eux l'effet inverse. Mais nous rentrons dans des phénomènes complexes, profitons donc plutôt d'admirer l'une des plus singulières et remarquables collection de pièrres fluorescentes avec toute leur installation qui sera livrée avec.
One common fluorescent is calcite. It come in almost every fluorescent colour due to different activators. Red and pink fluorescent calcites are often activated by lead and manganese. Calcite may fluoresce green due to uranyl ion traces. Calcite from the mercury mines at Terlingua, Texas, and just across the border into Muzquiz, Coahuila, Mexico, is a favorite. It fluoresces pink under longwave UV and bright blue under shortwave UV, with a uniquely bright blue phosphorescence after the UV lamp is removed.
Fluorite gave its name to fluorescence, but that does not mean it is always fluorescent. Many fluorites fluoresce a blue-violet color due to traces of europium, which is usually best under longwave UV, and show other fluorescent colors in some cases.
Willemite, a zinc mineral, often fluoresces a bright yellowish-green colour due to traces of manganese.
Scapolite (wernerie) from Ontario and Quebec, Canada, fluoresces a vivid orange-yellow under longwave UV, while shortwave UV creates a long-lasting phosphorescence that can be significantly brightened by holding it under a tap of running hot water, illustrating thermoluminescence. Several other fluorescent minerals come from the same area, including sodalite (hackmanite), cancrinite, diopside, fluorite and nepheline.
Franklin New Jersey is rightly known as the "fluorescent mineral capital of the world". Together with nearby Ogdensburg, it is the source of at least 260 minerals of which at least 56 are fluorescent. Many of these fluorites are found nowhere else in the world. A great number of them are uncommonly bright. Only the Franklin mine provided specimens with 5 or more different colours of equally bright fluorescence from the same number of minerals in one sole specimen
Willemite and calcite specimens glowing yellowish-green and orange-red respectively are not the most common fluorescents from this area: sometimes they combine with hardystonite (which fluoresces deep blue-violet), clinohedrite (which fluoresces orange) and maybe even esperite (which fluoresces yellow), for a truly unforgettable rainbow fluorescence.
List of minerals :
1. Fluorite Mine, Mount Hammam, Meknès, Meknès Prefecture, Morocco
2. Fire Agate, Sierra Madre mountain range, Mexico
3. Tennantite, Oruru, Cercado Province, Bolivia
4. Strontianite, Gabbelino, Tuscany, Italy
5. Sphalerite, Campbell mine, Bisbee, Warren District, Arizona, USA
6. Willemite, Franklin mine, Franklin, New Jersey, USA
7. Wernerite, var, Scapolite, Greenville, Quebec, Canada
8. Sodalite, Poudrette quarry, Mont St-Hilaire, Quebec, Canada
9. Fluorite, Weardale area ("Cumberland"), County Durham, England
10. Fluorite, Greenleaf mine, Fluorite Ridge District, Luna County, New Mexico, USA
11. Native Sulphur on Aragonite, Agrigento, Sicily, Italy
12. Apaptite, Muscovite, Golconda pegmatite, Governador Valadares, Minas Gerais, Brazil
13.Topas on Wolframite,Panasqueira mine, Panasqueira, Covilha, Castelo Branco District, Portugal
14. Agate Geode, Nowy Kosciot, Poland
15. Prehnite,New Jersey, USA
16. Red Corundum, var. Ruby, Froland, Arendal, Aust-Agder Fylke, Norway
17. Calcite, Meggen mine, Lennestadt, North Rhine-Westphalia, Germany
18. Willemite, Calcite, Franklinite, Franklin mine, Franklin, New Jersey, USA
20. Semi-Opalite, Opalite, Virgin Valley, Nevada, USA
Quelle est la cause de la fluorescence?
Certains minéraux sont donc fluorescents quand ils sont soumis à une source de lumière ultraviolette. Le phénomène est soit une propriété intrinsèque du minéral, soit lié à la présence d'impuretés que l'on nomme des activateurs et des co-activateurs de fluorescence. Dans le premier cas, la fluorescence est pratiquement constante quelque soit la localisation du minéral alors que dans le second cas la fluorescence sera rendue aléatoire puisque liée à la présence ou non de ces substances. Ceci explique pourquoi une Calcite par exemple sera fluorescente en rouge alors qu'une autre sera fluorescente en bleu. Sachez aussi qu'il existe des inactivateurs de fluorescence qui ont quant à eux l'effet inverse. Mais nous rentrons dans des phénomènes complexes, profitons donc plutôt d'admirer l'une des plus singulières et remarquables collection de pièrres fluorescentes avec toute leur installation qui sera livrée avec.
One common fluorescent is calcite. It come in almost every fluorescent colour due to different activators. Red and pink fluorescent calcites are often activated by lead and manganese. Calcite may fluoresce green due to uranyl ion traces. Calcite from the mercury mines at Terlingua, Texas, and just across the border into Muzquiz, Coahuila, Mexico, is a favorite. It fluoresces pink under longwave UV and bright blue under shortwave UV, with a uniquely bright blue phosphorescence after the UV lamp is removed.
Fluorite gave its name to fluorescence, but that does not mean it is always fluorescent. Many fluorites fluoresce a blue-violet color due to traces of europium, which is usually best under longwave UV, and show other fluorescent colors in some cases.
Willemite, a zinc mineral, often fluoresces a bright yellowish-green colour due to traces of manganese.
Scapolite (wernerie) from Ontario and Quebec, Canada, fluoresces a vivid orange-yellow under longwave UV, while shortwave UV creates a long-lasting phosphorescence that can be significantly brightened by holding it under a tap of running hot water, illustrating thermoluminescence. Several other fluorescent minerals come from the same area, including sodalite (hackmanite), cancrinite, diopside, fluorite and nepheline.
Franklin New Jersey is rightly known as the "fluorescent mineral capital of the world". Together with nearby Ogdensburg, it is the source of at least 260 minerals of which at least 56 are fluorescent. Many of these fluorites are found nowhere else in the world. A great number of them are uncommonly bright. Only the Franklin mine provided specimens with 5 or more different colours of equally bright fluorescence from the same number of minerals in one sole specimen
Willemite and calcite specimens glowing yellowish-green and orange-red respectively are not the most common fluorescents from this area: sometimes they combine with hardystonite (which fluoresces deep blue-violet), clinohedrite (which fluoresces orange) and maybe even esperite (which fluoresces yellow), for a truly unforgettable rainbow fluorescence.
List of minerals :
1. Fluorite Mine, Mount Hammam, Meknès, Meknès Prefecture, Morocco
2. Fire Agate, Sierra Madre mountain range, Mexico
3. Tennantite, Oruru, Cercado Province, Bolivia
4. Strontianite, Gabbelino, Tuscany, Italy
5. Sphalerite, Campbell mine, Bisbee, Warren District, Arizona, USA
6. Willemite, Franklin mine, Franklin, New Jersey, USA
7. Wernerite, var, Scapolite, Greenville, Quebec, Canada
8. Sodalite, Poudrette quarry, Mont St-Hilaire, Quebec, Canada
9. Fluorite, Weardale area ("Cumberland"), County Durham, England
10. Fluorite, Greenleaf mine, Fluorite Ridge District, Luna County, New Mexico, USA
11. Native Sulphur on Aragonite, Agrigento, Sicily, Italy
12. Apaptite, Muscovite, Golconda pegmatite, Governador Valadares, Minas Gerais, Brazil
13.Topas on Wolframite,Panasqueira mine, Panasqueira, Covilha, Castelo Branco District, Portugal
14. Agate Geode, Nowy Kosciot, Poland
15. Prehnite,New Jersey, USA
16. Red Corundum, var. Ruby, Froland, Arendal, Aust-Agder Fylke, Norway
17. Calcite, Meggen mine, Lennestadt, North Rhine-Westphalia, Germany
18. Willemite, Calcite, Franklinite, Franklin mine, Franklin, New Jersey, USA
20. Semi-Opalite, Opalite, Virgin Valley, Nevada, USA
Condition
100% natural, all the pieces are perfect, nos restoration, no repeinted. extraordinary piece. first time in auction. superb collection.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."