Appennino Emiliano
Re: Appennino Emiliano
Da Castagnola, Vagli Sotto, Provincia di Lucca , Toscania, Italia, aggregati di cristalli tabulari, striati, rosso magenta, di piemontite. https://www.mindat.org/photo-1280707.html. FOV 11,5 mm.
Re: Appennino Emiliano
Appennino toscano... anche se solo per cinque chilometri. 
Michiel Desittere
Benedetti siano gli istanti
e i millimetri
e le ombre delle piccole cose.
(Fernando Pessoa)
Benedetti siano gli istanti
e i millimetri
e le ombre delle piccole cose.
(Fernando Pessoa)
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Luciano Vaccari
- Messaggi: 11127
- Iscritto il: mer 30 giu, 2004 8:23
- Località: Via Pietro Giusti 23 41043 Formigine -MO-
Re: Appennino Emiliano
Esatto, pur se sul confine cerchiamo di tenere ordinati i topic rispettando il titolo...qui solo minerali dell'appennino Emiliano, grazie.
(Bel campione Franco, al di là dello sconfinamento)
(Bel campione Franco, al di là dello sconfinamento)
Ben oltre le idee di giusto e di sbagliato c'è un campo. Ti aspetterò laggiù.
(Jalaluddin Rumi- XIII sec.)
Luciano
Socio AMI zona Modena
(Formigine)
(Jalaluddin Rumi- XIII sec.)
Luciano
Socio AMI zona Modena
(Formigine)
-
Michele Dondi
- Messaggi: 113
- Iscritto il: sab 03 dic, 2005 16:36
Re: Appennino Emiliano
Marinoni, L., Caucia, F., Gilio, M., & Scacchetti, M. (2023). Evaluation of the Gemological Properties of Datolites from the Campotrera Deposit in the Northern Apennines (Italy). Minerals, 13(8), 1057.
Abstract: This work investigates the gemological properties of the datolite from the famous field of Campotrera near Reggio Emilia in Italy, for a possible commercial use in the market. This mineral occurs in widespread multi-centimeter veins, together with calcite and prehnite, within polygenic breccias in basaltic ophiolites. The most common form for this datolite is the double wedge with a prism (110) and a pinacoid (001). The gems obtained are mixed or carré cut, colorless or salmon pink, transparent, with a vitreous luster and weight between 1 to 5 carats. They have high brilliance, transparency and birefringence, glassy luster, absence of cleavage. The major chromophore is probably Fe, which occurs as inclusion of hematite and ilmenite. Raman investigations highlighted different fluid inclusions. The primary are randomly distributed or, in some cases, follow the growth zones, while the secondary form aligned tracks along the microcracks. Fluid inclusions can be biphasic and made up by liquid + gas (L + G), generally >10 mm in size, and more rarely, monophasic, composed only by liquid (L) generally <10 mm. The gems extracted from the rough sample are very valuable but their delicacy requires attention in the cutting and preparation of the jewels.
Scaricabile gratuitamente:
https://www.mdpi.com/2075-163X/13/8/1057
Abstract: This work investigates the gemological properties of the datolite from the famous field of Campotrera near Reggio Emilia in Italy, for a possible commercial use in the market. This mineral occurs in widespread multi-centimeter veins, together with calcite and prehnite, within polygenic breccias in basaltic ophiolites. The most common form for this datolite is the double wedge with a prism (110) and a pinacoid (001). The gems obtained are mixed or carré cut, colorless or salmon pink, transparent, with a vitreous luster and weight between 1 to 5 carats. They have high brilliance, transparency and birefringence, glassy luster, absence of cleavage. The major chromophore is probably Fe, which occurs as inclusion of hematite and ilmenite. Raman investigations highlighted different fluid inclusions. The primary are randomly distributed or, in some cases, follow the growth zones, while the secondary form aligned tracks along the microcracks. Fluid inclusions can be biphasic and made up by liquid + gas (L + G), generally >10 mm in size, and more rarely, monophasic, composed only by liquid (L) generally <10 mm. The gems extracted from the rough sample are very valuable but their delicacy requires attention in the cutting and preparation of the jewels.
Scaricabile gratuitamente:
https://www.mdpi.com/2075-163X/13/8/1057
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