Sant'Antioco, South Sardinia Province, Sardinia, Italy

Sample with 10x8x4cm - April of 1989

© Photo & Collection of Martins da Pedra

Opal with probably Manganese Dendrites. Zone of 3x2,5 cm. Photo & Collection Chinellato Matteo

© Chinellato Matteo

Botryoidal hyalite opal glows a rich green under short wave fluorescent illumination. Andesitic matrix. Field of view 9 cm wide. Collected by Giorgio Spiga in August 2006. Now RFC C1135.

© 2006 Michael C. Roarke

Opal var. Hyalite from Sardinia. The zone measure 2x2 cm. Photo & Collection Chinellato Matteo

© Chinellato Matteo

Opal var. Hyalite from Sardinia. The zone measure 4x3.5 cm. Photo & Collection Chinellato Matteo

© Chinellato Matteo

dimension area mm. 2 x 2 probable Aegirine photo and collection Luigi Chiappino

Opal var. Hyalite. Specimen size:10x6x4.5cm. Photo and collection Piras Martino(rougemin)

Beautiful transparent bottle-green clinoferrosilite crystals on volcanic matrix of crystallised sanidine and amethyst. Newly-analysed material, collected by Marzio Mamberti in the early 2000s. Purchased from him in 2019.

© Andrew Hodgson

Specimen and Photo Bruno Marello

© Marello Minerali

Opal var. Hyalite. Specimen size:5.2x2.5x3cm. Photo and collection Piras Martino(rougemin)

Black Clinoferrosilite crystals associated with purple Amethyst crystals and colourless Sanidine crystals Acquired from Marzio Mamberti (New Brand Minerals) on E-Rocks on 1 May 2020

Black clinoferrosilite crystals with purple quartz (amethyst) on white sanidine from Sant'Antioco - Sardinia - Italy

© jean-vincent.coureau

Specimen Marco Bertan Photo Bruno Marello

© Marello Minerali

Status: RARE mineral. Class: Silicates. Subclass: Inosilicates. Crystal system: Monoclinic. Prismatic crystals of clinoferrosilite with pyramidal termintion. Pyroxene Group. Former Pércio de Moraes Branco Mineral's Collection, Capão da Canoa, Rio Grande do Sul, Brazil. Photography: Luciano Valério.

© Paulo Neves

Bottle-green prims of clinoferrosilite & hexagonal purple amethyst, on sanidine matrix. This locality probably provided the best crystals for clinoferrosilite which has been rarely found in single euhedral crystals. Sony Alpha 7R ii/Mitutoyo Plan Apo X10 /180 mm Achromatic doublet retro/"Stone Master Stack Unit "/ Linear-actor & Control/ ...

© Christophe Boutry

Collection and photo Henk Smeets

© www.tomeikminerals.com

Specimen Marco Bertan Photo Bruno Marello

© Marello Minerali

Aegirine from Sant Antioco - Sardinia - Italy

© jean-vincent.coureau

Well formed, dark olive green, prismatic crystals of clinoferrosilite, assoiated with two blocky, light purple amethyst crystals. Sony Alpha 7R IV A/Mitutoyo Plan Apo X 5/Achromatic doublet retro/"Stone Master Stack Unit" linear-actor & Control/Aperture. Description : Herwig Pelckmans. Photo & Collection Christophe Boutry /April 2024.

© Christophe Boutry

Sculptural plate of hyalite proudly covering a side of solid volcanic rock matrix. Hyalite is exceptionally transparent and with a textbook glassy lustre, very clear of damage overall and with a significant aesthetic.

© Luis Costa

Clinoferrosilite A multitude of very nice, sharp, sometime twinned, green crystals of clinoferrosilite, many of which stand straight on the matrix, together with small crystals of amethyst on a bed of colourless-milky sanidine crystals. Clinoferrosilite is a clinopyroxene dimorph of ferrosilite and isostructural with clinoenstatite. ...

© New Brand Minerals (2024) - All Rights Reserved

FOV 6 x 4 mm Collection and photo Roberto Bosi

© Roberto Bosi

Aegirine from Sant'Antioco - Sardinia - Italy

© jean-vincent.coureau

FOV 8 x 6 mm Collection and photo Roberto Bosi

© Roberto Bosi

Blocky purple amethyst crystal & bottle-green prisms of clinoferrosilite , on sanidine matrix. Sony Alpha 7R ii/Mitutoyo Plan Apo X 5 /180 mm Achromatic doublet retro/"Stone Master Stack Unit "/ Linear-actor & Control/ Aperture. Photo & Collection: Christophe Boutry.

© Christophe Boutry

Clinoferrosilite A multitude of very nice, sharp, sometime twinned, green crystals of clinoferrosilite, many of which stand straight on the matrix, together with small crystals of amethyst on a bed of colourless-milky sanidine crystals. Clinoferrosilite is a clinopyroxene dimorph of ferrosilite and isostructural with clinoenstatite. ...

© New Brand Minerals (2024) - All Rights Reserved

Black clinoferrosilite crystals from Sant'Antioco - Sardinia - Italy

© jean-vincent.coureau

Shiny black gemmy Smoky Quartz crystals partially covered by an encrusting glaze of iron oxides attributable to Goethite. Bought at St.-Vincent Mineral Fair, 2024. Photo and collection Alessandro Cantamessa (#2459).

Chocolate brown elongated crystals of clinoferrosilite. Exchanged by Gianluca Odicino during the GOM meeting in 2023. Photo and collection Joachim Esche.

© Joachim Esche 2025

Bottle-green prismatic clinoferrosilite crystals. Sony Alpha 7R IV A/Mitutoyo Plan Apo X 5/Raynox DCR 150/"Stone Master Stack Unit" linear-actor & Control/Aperture. Photo & Collection: Christophe Boutry/ february 2026.

© Christophe Boutry

Amethyst with black clinoferrosilite. 5MP Chinese unbranded CMOS camera with bellows and Nikon 4X Plan Achromatic Objective Lens. Processed with Zerene stacker DMap and post stacking clean-up with Faststone and PhotoScopeX. Collection and photograph of Rod Martin.

© RJ Martin

© Marzio Mamberti

© Marzio Mamberti

Almost the entire island is made up of volcanic rocks of Miocene age. In this photo a portions of basaltic rocks of the South region of Sant'Antioco Island.

© Giuseppe Pappa