NOTES FOR NEW COLLECTORS
Fluorite has alwas fascinated the humans. Indeed, the large number of colors and also the diversity of crystallizations make fluorite as an entire part of a collection. But, your look can go to others minerals...
This page has not the target to give lessons. But, it only wants to share a passion for minerals with young collectors. Hesitations due to the beginning of a collection can appear and it's why we suggest some ideas that will help you in your search:
the constitution of a collection :
It can be made by different ways: you can collect all the minerals, without restriction (if it's not money), and you can choose your specimens according your heart during visit of mineralogical stock exchange... It's often how people begin.
Day after day, month after month, the quantity of specimen increase in your display cabinet, your signht is refining, your unconscious is making chooices and is guiding the conscious. So, you take off specimens became unworthy of interest,, in order to replace them by others.
The wish of a thematic collection can appear (if it's not done since the beginning). So, you can collect fluorites, or calcites...etc. It is a thematic based on one specy, but the choice can also be about a country (England, Brazil...), see a partcular site (the site of Tsumeb-Namibie) the minerals of the Minas Gerais-Brésil, ...).
The size of the minerals can also be an other factor. After you got your glass magnifying until 100x, approximately, your choices will be for very small samples, not really expensive and in which crystallizations are prefect... but invisible to human eye.
Finally, the standard "minerals found at home" can be given. You make a collection of specimens found by yourself... the only problem is that the research is not easy, because, even if the mineralogical inheritance is impotant in our country, the access to the sites of minerals is more and more difficult (closing of mines, private sites...). Foreign countries still leave a door opened on new discoveries...
To conclude this paragraph, we have to say that having pieces with a good quality requires a lot of patience, contacts, discussions ...and personal research.
2) An help ?
A minimum of knowledge is necessary in order to have a presentiment of the piece that will enrich your collection. You have not to be a senior specialist. Yet, in the first time,it's not useless to be with a lover more experimented.
Trust your instinct :
4) Attraction for the "new"...
It's not a reason to be abused when you see a new unique specimen. Allright, a nice specimen has a commercial value but you have not to pay any price. It is probable that other minerals with the same origine will appear during the next months...so, patience can pay in some case. Only the chance then the routine will guide you.
In exchange gallery, torbernite specimens from Margabal are presented: during the discovery of these cristallizations, prices increased. Now, they are decreasing. And we can think that the fall will go on... It will be possible if new discoveries of specimens with a such quality were found. However, due to the building site, the difficulty for the progress of the works... the probability is very low. Yet, chinese green fluuorite specimens can see their price increase from a stand to another one: mines are still in activity and discoveries take place each day... But what about the specimen of exception...? s
Stock exchanges can give you an idea of the commercial value of fluorite that can enrich your collection. The most of the time we give an estimation because commercial price can be naturally higher. A commercial marge is done.
it exists exceptions. Lastly, chinese fluorite appeared in different mineralogical
stock exchanges. The most spectacular one had 40cm of diameter, and was composed
of blue crystals, gemmes... and intacts. A real specimen of museum. its price
was about 20 000 euros.
Just one question to ask: shall i buy it and not buy other pieces during x years, being sure to no see it later? Of course, everything depends on financial possibilities, but this exemple can be translated for other pieces at a lower price.
Specimens to choose :|
We have not to forget that each stone is unique. Consequently, the estimation cannot be substitued to the specificity of a similar stone: shape, size, purety, aesthetics and association with others minerals... are elements that can sometimes change a price in very important ratio. These standards can refine with time...
Some "purists" will be interested in crystals in which you can find the shape and the color are disappointing: be careful because you can have in front of you a systematicist This last one will look for all the pieces representative of a mine in order to have an exhaustive sight of the richness of the site (ex: Berbes, asturies - Spain - delivered cristallizations of fluorite of all qualities: from purple "amethyst", to the very light pink where the sides are corroded...).
The litterature about the subject
In spite of fluorite has always interested collectors, the litterature stays limited in this field.
"paper" editions :
Spathfluor.com is not only there in order to represent the book about the mine and minerals found in Valzergues. It's there in order to insist on the fact that you will also find for what this fluorite was used.
The BRGM report of Jean Féraud can also bring multiple knowledges about the subject.
Numerous are the websites dealing of this nice mineral. Some of them are presents in the links (selection).
Spathfluor is not only the transcription of a passion, the website and the book of Valzergues are also windows opened as big as possible on the wonderful world of minerals and the sharing of knowledge.
Mineralogy and mining tools are compatible...
TRAPS TO BE AVOIDED
US VERSION (to be translated... thank you for your patience!!!)
text presented here is not to make us play a role " upholders of the law"
in mineralogy, but just to show you some modifications, arrangements or forgeries(imitations)
which we are all susceptible to meet one day.
We can distinguish several categories:
The synthesis: take some common salt ( NaCl), dissolve some grams in some water (50ml and once the totally made dissolution, pour your mixture into a ramekin which you will forget voluntarily on the height of a cupboard, for example (immovable place - in theory!). When all the water will be evaporated, you will find beautiful small cubic crystals. The same system, in the industrial scale (and with techniques considerably more developed - Verneuil processing...) allows to form ruby crystals (used in lasers), diamonds (very small and used as abrasive for saws)... We saw, a few years ago, some crystals of copper sulphate which were spectacular but now forbidden for sale because of young children poisoning.
The irradiated specimen: It is a question of giving a more "commercial" appearance. The typical example is the morion quartz of Arkansas. Initially, it is white, crystal clear and after gamma irradiation, it turns black and brilliant. So, it is sold better thanks to some hours of human intervention... The natural irradiation, on the other hand, takes several thousand years: morion quartz of the "Massif Central", the alpine smoked quartz... How to recognize natural irradiated of the artificial irradiated? We are only giving tracks...
The warmed specimen: Classic phenomenon and "successful candidate" (under certain reserves, notably that to warn the buyer!) in gemology. The most common examples are:
topaz: very blue, it is very possible that it was warmed. But there are
blue topazes not warmed in sharply rarer quantity...
The examples are numerous...
The restuck specimen (in place): it occurs for specimens of big rarity, either those to whom the collector will attach a sentimental importance for example. Some pink fluorites of the "Mont Blanc" were restuck in place on quartz smoked on which they had developed. We can see also the example with the esmerald on gangue... The honesty would want that we indicate this repair during the sale. It's the same for specimen with strengthened gangue to avoid that all the specimen to be transformed into puzzle!
The stuck specimen.. with different minerals (the "mineralogical medley"): we find them according to the mineralogical culture of the manufacturers. Indeed, some will not dare to associate a fluorite to an agathe!!!! But others will dare completely plausible more subtle associations: the association of 2 minerals of same format, but from different places...
In the same genre and very common, we find the " Berber geodes ": these are geodes of chalcedony whose mineralogical interest is limited, and on which we papered the inside of galena cubes (different sizes for specimens more elaborated!). This is made by depositing a film of glue then by placing some cubes obtained by natural cleavage of the galena. The rest of the geode is then performed with residues of cleavage (powder) of the galène, which are going to stick in the not yet busy zones. It is the archetype of the "false specimen"...
The modified specimen: it is necessary to distinguish the the face and the back. Here, we only present the mineralogical interesting face (example: the crystallized malachite). On the other hand the work on the back of the specimen cannot be considered as a imitation.
About the modification of the crystallizations, this can be made by various chemical and\or mechanical means. An example was a quartz which had undergone some small shocks during its extraction. This specimen had an important value. To present it without showingit has been hand modified, some fluorhydric acid had been used to give a natural aspect to the breaks (*)
DO NOT MERGE WITH...
work on the matrix(back of the specimen) : il nous semble indispensable
de parler ici de ce travail qui peut être effectué avec plus ou moins
de finesse, en fonction des moyens techniques dont on dispose.
Le nettoyage des minéraux : Là aussi, certains puristes diront qu'un minéral ne doit pas être nettoyé, et présenté tel qu'il a été trouvé. Il est extrêmement rare de trouver un minéral qui ne soit pas sali, soit par des oxydes de fer, soit par de la "boue", ou bien par d'autres produits secondaires qui découlent de l'altération de la roche encaissante et qui sont plus ou moins tenaces. Une fluorine (par exemple!), aussi belle et brillante soit-elle, sous une couche d'oxydes de fer ne présente aucun intérêt. Pour cela des produits divers peuvent être utilisés. Le plus difficile est d'utiliser celui (ou ceux) qui n'ont pas d'action destructrice sur la cristallisation qui nous intéresse... La Revue "Le Règne Minéral" présente depuis le mois de juin 2004 des méthodes de nettoyage.
Nous parlions d'utilisation d'acides pour mettre en valeur des pièces minéralogiques. Certes, il peut y avoir une dérive comme mentionnée ci dessus (voir *), mais son utilisation est particulièrement bien adaptée pour dissoudre le quartz de certain échantillons qui seraient invibles sans ce procédé. A titre d'exemple, nous pouvons prendre les derniers octaèdres de fluorine chinoise qui sont initialement noyés dans le quartz. Leur couleur bleu-vert est ainsi mise en valeur. Mais ceci s'est également vu pour quelques rares pièces de fluorine et barytine du Maroc qui étaient dissiulées sous plus d'un centimètre de quartz marron, sale... et sans aucun intérêt minéralogique.
Ainsi, et nous le répétons, ceci n'a pour but que de developper un petit peu l'esprit critique du lecteur. Nous n'avons pas la prétention de tout savoir, mais nous tenons juste à informer quant aux surprises que l'on peut découvrir...
ailleurs, si vous êtes en posséssion d'un"faux" ou specimen
qui n'est pas "conforme aux lois naturelles", vous pouvez aussi nous
le faire savoir. Spathfluor se fera un plaisir d'enrichir cette rubrique... en
restant discret, cela va de soi!
Remerciements aux collectionneurs qui nous ont confié leurs échantillons.
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