All posts by manforas

fluorite jaimina

Jaimina fluorite update!

We offer to our clients some fine fluorites from Jaimina Mine, Asturias, Spain.

Go to main page to see Jaimina fluorite specimens. Click here!

This less known mine in Asturias has been active for some decades but it has never been a prolific mine in quality specimens. Therefore, good specimens from Jaimina Mine are highly sought after by fluorite collectors, especially by those who already have specimens from the most common localities in Asturias such as Berbes, Emilio Mine, La Viesca (La Collada), La Moscona, etc.

This update comprises eleven specimens and seven of them are from the same pocket. This very small pocket, which I call “The Hidden Pocket”, yielded very few specimens, but they delight us with a crystal quality rarely seen in this mine. In its size these are top quality specimens for the locality: they just glow like gems! These excepcionally gemmy modified cubes (tetrahexahedron) are mostly water clear, just a hint of light blue in a few specimens. Some of them are associated with white barite blades and you can see nice sulphide inclusions in a few of them. Please enlarge the photos to fully appreciate the awesome crystal patterns of these specimens!

The Hidden Pocket was overlooked for a long time until an astute miner started to dig out white fluorite sand (just like sugar!) out of a very small cavity. He was getting rid of the white sand and in the process recovering these fantastic specimens. All specimens collected were completely floaters with no point of attachment to the limestone walls. The white fine sand surrounding each specimen helped to preserve those in pristine condition!

Apart from this pocket and to give a bit of variety, we also include four older specimens from different pockets that also deserve a good look.

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All the best,

Juan F. Buelga

ニューアルオープン! ~Spanish Minerals~

ニューアルオープン! ~Spanish Minerals~

 今回はSpanish Mineralsのリニューアルオープンを記念して、新しいSpanish Mineralsについて軽く紹介することにしましょう。

Spanish Mineralsではこれらの地球の生み出したアートといえる標本に特化しています。

ニューアルオープン! ~Spanish Minerals~

特にオーナーのJuan F. Buelga 氏が最も情熱を注ぐアストゥリアスの蛍石は世界一と言っても過言ではないでしょう。

また、Mineral PhotographyやSpanish Minerals Luxury Toursなど多くのサービスを行っています。そして産地情報から博物館にいたるまで鉱物コレクターにはたまらないコンテンツ満載のブログも実は隠れたおすすめです!是非一度ご覧になってみてください。

※ 以前のサイトでは英語のみ対応でしたが、新サイトでは自動翻訳機能と通貨換算が追加されたのでこれで英語を読む手間がなくなりました。将来的には日本語に完全対応の予定だそうです。

Juan F. Buelga & Mos

Value of fine fluorites

Why fine fluorite specimens are so highly valued?

From time to time, I listen to heated discussions among mineral collectors about why common mineral species like fluorite, quartz or calcite can be so highly valued. Among the previously cited minerals, fluorite is the one which produces more buzz by far.

Fine fluorite specimens have fetched extremely high prices during the last years. Indeed, they have sometimes surpassed in price to “elite minerals” like tourmalines or beryls. Are they worth that much?

Yesterday I went for a swim nearby, here in Perth, and I grabbed the first Mineralogical Record I saw in my home to take it with me. It was the special number called “Mineral Collections in Texas”, a beautiful one indeed! Well, I made some numbers based on the mineral species represented in each collection and I found some pretty amazing results: approximately 80% of the mineral collectors represented fluorite specimens among their minerals! Out of 44 collectors who appear on the magazine only two did not display any fluorite, quartz, calcite or baryte specimens. Why I am saying all this?

The importance of aesthetics in mineral specimens is gaining momentum every year and prices are less influenced by the mineral specie. It is a fact that a greater number of aesthetically oriented mineral collectors are entering the fine mineral specimen market. Many are knowledgeable about the rarity and properties of each specie but aesthetics are of paramount importance for them.

A widely distributed mineral has more chances to be form by earth as an aesthetic fine mineral.

Fine mineral collectors/dealers don’t value specimens per carat or gram. It is true that we have some similarities to what gem collectors value as transparency, color intensity, etc. But we have a big and important difference from gem related people: we pay for aesthetics, balance, composition, call it whatever you want, you know what I mean.

Fine fluorites
Fluorite on quartz. Fernandez Buelga Mineral Collection. Juan F. Buelga photo.

I would dare to say that is more difficult to assess the value of a fine mineral specimen than the one of a gem. To pick the best fine minerals among hundreds of them you need a much trained eye for aesthetics. You can tell me: “Juan, aesthetics are very subjective!” Ok, but there are certain parameters which are universal.

People used to name minerals like tourmaline or beryl like species which have to be more expensive than common ones. Are we buying our fine minerals to make rings or necklaces? Of course not! Which is the main difference between those elite minerals and fluorite? Hardness. Tourmaline is 7 and fluorite is 4 in the scale of Mohs. Apart from mineral hardness, let’s compare some “elite species” against fluorite.

Fluorite endures the war against tourmaline or beryl and I think it wins a few very important battles:

  •  Color: dead heat between fluorite and tourmaline! Maybe beryl is behind because the rarity of different colors in the same crystal.
  •  Luster: dead heat!
  • Transparency: dead heat!
  • Size: maybe fluorite wins.
  • Aesthetics: dead heat!
  • Crystal form: fluorite clearly wins for its remarkable multitude of crystal forms.
  • Association: fluorite wins, absolutely. Fluorite is not only a pegmatite mineral.

If you are thinking I have not kept in mind rarity as another important factor, let me say that nowadays with Pakistan, Afghanistan, Brazil, etc. as big sources for these “elite minerals”, they are not anymore rare (mediocre specimens are going quite cheap nowadays!) Anyone can buy average fluorites and just exactly the same stands for nice tourmalines or beryls. Moreover, I would say, truly aesthetic, top quality mineral specimens are always very rare to find, regardless the mineral specie we are talking about.

In my opinion only fluorite confronts the big names of tourmaline or beryl. Other extremely beautiful and highly priced minerals like pyromorphite or rodocrosite loose important battles like color variation, transparency or size. Or I have missed a blue rodo and a transparent large cabinet sized pyro crystal!?

As the Extra Lapis Fluorite (by editors Jesse Fisher, Miranda Jarnot, Günther Neumeier, Arvid Pasto, Gloria Staebler and Tom Wilson) says in its cover page:

“Fluorite, the collector’s choice.”


Brochant mineralogy
Brochant mineralogy

Traité  Élémentaire  De Minéralogie, Suivant  Les Principes Du Professeur Werner,  Conseiller Des Mines De Saxe.  BROCHANT DE VILLIERS, André Jean Marie.

Collation: 2 vols. Vol 1: 1 folding plate (24 figures of crystal drawings)

Page size: 122 x 199 mm.

Binding: contemporary mottled calf, gilt decorated spine with morocco title-labels.

Provenance: exlibris “M.r Charles MONIER de la SIZERANNE”. Unknown previous exlibris.

Collection: Fernandez Buelga




perth minerals, mineral collecting venue

MinSocWA SWAP-SELL Day Sunday 12th April

To members and friends of the Mineralogical Society of Western Australia:

You are invited to come along for the MinSocWA SWAP-SELL Day Sunday 12th April.

Come along to swap / buy / sell anything related to mineralogy – geology or mining.

Mineral specimens, books, photos, magazines, field equipment, optical instruments, goniometers, crystal models, etc

As always, we will have the MinSocWA microscope and UV lamp available should you wish to examine a specimen more closely.
When: Sunday 12th April 2015 from 10 AM to 3 PM
Where: premises of WA Lapidary + Rockhunting Club at 31 Gladstone Road, Rivervale, Perth.
Cost: $2 door charge applies



帕纳什凯拉矿(葡萄牙)的开采始源于1898年,最早可以追溯于罗马人和之后的摩尔人对锡的挖掘。Beralt Tin and Wolfram, Ltd (一家英国公司)在1927年获得了这里的采矿权。如今帕纳什凯拉是世界做大的钨矿之一,并且在日本Soj i t z 公司下运营。帕纳什凯拉矿区有很多矿山,Corga Seca, Barroca Grande, Panas quei ra, Vale da Ermida和一些较小的。有一些很多年前就已经关闭,比如Vale da Ermida,这个矿山最后为帕纳什凯拉矿区历史贡献了一些很好的矿物学例子。

The old Panasqueira Mines village in the 50's, some miners still live here but the majority of them has moved to Barroca Grande village, where the main mine entrance is nowadays.

50年代的老帕纳什凯拉矿村,一些矿工仍住在这里,但他们中的大多数以搬到 巴洛卡兰德村,是如今矿上的主要入口

上述村子的今天。很久以前有几百人住在哪里,现在只有几个。在树之后可以 看到老电影院。来自Juan Fernandez Buelga的照片

上述村子的今天。很久以前有几百人住在哪里,现在只有几个。在树之后可以 看到老电影院。来自Juan Fernandez Buelga 的照片


帕纳什凯拉矿区的矿床是西欧钨的主要来源。帕纳什凯拉矿区位于葡萄牙的 Beira Baixa 省,在 Fundao 市西面34公里。



来自帕纳什凯拉的蓝绿色磷灰石菱铁矿晶体。 西班牙的矿物标本。来自Juan  Fernandez Buelga的照片

来自帕纳什凯拉的蓝绿色磷灰石菱铁矿晶体。 西班牙的矿物标本。来自Juan Fernandez Buelga 的照片


紫色磷灰石和石英。葡萄牙帕纳什凯拉。西班牙矿物标本。来自Juan Fernandez  Buelga的照片。

紫色磷灰石和石英。葡萄牙帕纳什凯拉。西班牙矿物标本。来自Juan Fernandez Buelga的照片。

精湛的毒砂和少量的石英,菱铁矿和萤石。西班牙矿物标本。来自Juan  Fernandez Buelga的照片

精湛的毒砂和少量的石英,菱铁矿和萤石。西班牙矿物标本。来自Juan Fernandez Buelga的照片。


尽管没有花岗岩的露头, 已在帕纳什凯拉矿区浅层地区发现花岗岩拱顶(帕纳什凯拉花岗岩)并且至少在空间上与成矿有关。帕纳什凯拉的花岗岩热液蚀变使它与西班牙其他地区露出的西海期侵入花岗岩没有了相关性。然而,从它未行变的条件下,花岗岩的形成位置是利用了早期的节理(在区域变质后),显然他是在西海造山运动主要的压缩阶段之后形成的。同位素分析得出帕纳什凯拉花岗岩属于S型花岗岩。

Map of Portugal showing location of Panasqueira and the distribution of Hercynian granitic rocks



panasqueira estructure 2

panasqueira estructure 1



像这种绿蓝色石英和棕色方解石的稀世珍品在帕纳什凯拉矿有时看到。西班牙 矿物标本。来自Juan Fernandez Buelga的照片

像这种绿蓝色石英和棕色方解石的稀世珍品在帕纳什凯拉矿有时看到。西班牙矿物标本。来自Juan Fernandez Buelga的照片。

共生是相当复杂的因为是多种矿物,高阔石英,云母和黄铁矿,在一个序列中长时间存在,并且以一个重复的方式进行沉淀。尽管这些复杂,矿化的四个主要阶段已被确认和描述:(1)硅酸盐氧化物的阶段, ( 2)主硫化物的阶段,(3)磁黄铁矿侵变阶段,(4)后期碳酸盐阶段。在经济上,在第一阶段是目前为止最重要的,因为它包含了矿石矿物锡石和钨。

精湛的钨铁矿与白铁矿。 帕纳什凯拉矿。Juan Fernandez Buelga矿物收藏的标 本。来自Juan Fernandez Buelga的照片

20140226_panasqueira_update1 (16)


Munich Mineral Show 2014

Munich Mineral Show 2014

Munich Mineral Fair 2014

The largest and most important mineral fair in Europe is about to start! Yes, The Munich Mineral Fair is going to be held this week. Friday the 24th of October is the day for registered buyers and during the weekend it is open for everyone. This year the theme will be meteorites but,as every year, you will find there gems, stones, fossils and of course mineral specimens!

Those above are the main themes but there will be some booths offering mining parafernalia, antique books or tools for crystal hunting among other things. For example, Jörgen Langhof from NHM in Stockholm and Johan Kjellman, will have a small exhibit on old crystal models at M34-M35 in Hall A5.

This year I will miss the show but anyone interested in sharing some photos about the Munich Show 2014 is more than welcome to do it.

To contact me just send me an email to We appreciate any photo of the show you can send to us.

Link to the official Munich Mineral Show page

Juan Fernandez Buelga




Navajun, La Rioja, Spain. Pyrite crystals

以下の写真は、Navajun 鉱山で産出した黄鉄鉱である。この特徴的なキューブ型は世界的にも有名だ。


以下に示すのは「Piritas de Navajun SL」から引用したものである。


以下に示すのは「Piritas de Navajun SL」から引用したものである。

Navajun 鉱山

主に黄鉄鉱の結晶を多く産出するNavajun鉱山は、1960年に坑夫であるPedro Ansorena Garretによって発見された。

現在この鉱業資産は、Pedro Ansorena Conde、Jose Chaver Atanasio 、Nestor Lopez Ogaldeらによって結成されたPiritas de Navajun S.L.にある



また歴史学者によれば、La Rioja地方では黄鉄鉱を「聖カシルダの石」と呼びスリングショットの弾薬としてオオカミ撃退に使用していた。

La Rioja地方特有のこのエピソードこそが、Navajun鉱山にのみ大きく完全なキューブ型の黄鉄鉱が多く集中していることを示している。





これらの黄鉄鉱はLa Rioja地方に存在するジュラ紀の堆積物と同じ地質環境で、約125~130万年前に生成されたと考えられる。それゆえ恐竜の足跡の化石がこの地方の岩石から共通して発見されている。







Navajun鉱山の名の由来になった美しい村、「Navajun村」はAguilar del Rio Alhama地方に位置している。この村は1381年にエンリケ二世によってNavarran Gentile Juan Ramirez de Arellano, Senor de Cameros の支配下に置かれた。(※訳者注:スペイン語の単語により翻訳できず)

その際、近くにあったもう一つの美しい村、Aguilar Valdemadera村も同統治下におかれた。






Translated by Kuchinashi.