Iron-bearing Magnesite

Pseudohexagonal crystals of ferroan magnesite to 15mm diameter, with minor quartz. R. Bottrill specimen and photo.

© R. Bottrill 2006

Sample crystallized with 6x4x2,5cm - August of 2008

© Photo & Collection of Martins da Pedra

Width of field is 2.5 mm. Collection of Jesse Crawford. The depth of field has been enhanced using Helicon Focus (9 exposures). Equipment: Nikon D-100 digital camera on a homemade microscope.

© 2008 by Jesse Crawford

14cm x 12cm x 4cm orange/rust material is the ferroan magnesite (SEM-EDS tested) collected by Ken Gliesman at the Wright Mine dumps

© Kenneth Gliesman

9.5cm x 5cm collected by Ken Gliesman at the Old Mine

© 2011 Ken Gliesman

Ferroan Magnesite on Quartz Specimen and Photograph J. Melville.

© James Melville

Iron rich magnesite (EDX confirmed, Mg>Fe) with small limonite pseudomorph after pyrite (common at the locality). Photo by Bruce Cairncross. Darker specimens are normally siderite.

Magnesite Specimen and Photograph J. Melville.

© James Melville

Brown "breunnerite" crystals up to 1 cm. Kindly donated by G. Mencucci in 1993. Photo and collection Alessandro Cantamessa (#642).

Yellow Breunnerite and a white Calcite crystal On the right side is a pseudocubic Quartz

Black "breunnerite" crystals, group has a diameter of 4.4 cm. Collection Dr. Ferdinando Giovine.

© Christian Bracke

"Breunnerite" great and attractive plate with rare crystals yellow-honey Specimen measure tall 14 x 10 cm (sample found a first years ninety the west side of the Rotbachl peak) Collection Arturo Moro photo Manuele Moro

© Manuele Moro

great and attractive plate of several magnesite crystals up to 2,2 cm included on talc-schist field of view 22 x 16 cm (old found in 1990 from the west side of Rothbachl peak) Collection Arturo Moro photo Manuele Moro

© Manuele Moro

FOV 7cm Geode with limpid quartz crystals substratum covered by nice pink rhomboedral mesitite spar crystals. Collection and photo Yves Masson

© Yves Masson

Specimen size 10x8cm crystal size: 30x15mm

Mining Museum in Mühlbach am Hochkönig (=Mitterberg)collection Size ca. 7 cm

5.7 x 5.0 x 4.7 cm. Mesitine Spar is an uncommon variety of ferroan magnesite and is rare from the Traversella Mine. Intergrown, extremely flattened brown rhombs to 4.0 cm in jackstraw fashion form a shapely and excellent specimen. Interestingly, one side of the rhombs have high lustre, while the other side has a matte finish with nubby ...

© Rob Lavinsky & irocks.com

Tannish brown breunnerite variety of magnesite cleavage in green talc and blackish green antigorite. FOV = 3 cm

© Van King

Crystal of 20mm Franco Amadori photo. Paolo Franchi collection.

6.0cm x 3.5cm Orange-brown lenticular crystals (not analysed) in matrix ID on label: Mesitite (Mesitite/Mesitine are synonyms of Mesitin Spar). Other possible species/varieties are: - Brossite: A ferroan variety of Dolomite with up to 10% FeCO3 (Siderite component) - Mesitine Spar: A ferroan variety of Magnesite with the Mg:Fe ...

© mindat.org

Well formed, rhombohedral, bicolor (dark and pale brownish) Breunnerite crystals in the typic talc schist matrix. In my personal Alpine suite. Photo Simone Citon

© Simone Citon

Brownish crystals of Ferroan Magnesite var. Breunnerite in Steathite matrix with minor black magnetite octahedrons from the Prince's Soapstone Quarry, Lafayette, Philadelphia Co, Pennsylvania. An old 19th C. cobbled specimen with original pen and ink paste label on reverse. Ex. John Birkinbine (b. 1844, d. 1915) including an old Hugh Ford label, ...

© 2006 M. R. Heintzelman

peter neschen collection (07685)

© neschen

An old piece of paper mentions mesite, quartz, and chlorite. Rui Nunes' photo taken in April 2017.

© Rui Nunes 2017

peter neschen collection (04367) (from Coll. E.Löffler) Nikon D7000 + Sigma 150mm Apo Macro + Combine ZP

© neschen

Found in an Evaporite

© hamster@aon.at

Brown Breunnerite crystals in unidentified matrix Received from Willem 'Pink' Leenders on 17 December 2014

14.0 x 9.3 x 8.8 cm. Ferroan magnesite (variety breunnerite) is rare from this less well-known area of the Ziller Valley. It has a Mg:Fe atomic ratio ranging from 90:10 to 70:30 and was originally reported from several Austrian localites (MINDAT). Moderately lustrous, sharp, jet-black rhombs, to 2.5 cm, are richly scattered on the striking, large, ...

© Rob Lavinsky & MineralAuctions.com

Breunnerite from famous quarry collected during Mindat Adventure to the Urals.

© Dmitry Tonkacheev

Several well-shaped braunnerite crystals on talc schists collected during the Urals Mindat Adventure in July 2019.

© Dmitrii Tonkacheev

Breunnerite, property of Paolo Piazza Specimen displayed in the exhibition titled "Cristalli. Scrigno del territorio. I carbonati e il loro impiego nel quotidiano" at Torre Viscontea, Lecco. Saturday 19 December 2016 – Sunday 05 February 2017. Organized by Sistema Museale Urbano Lecchese in cooperation with Gruppo Mineralogico Paleontologico ...

Breunnerite the crystals are mm 12 x 17 and mm 11 x 16 Photo and collection Giovanni Scapin

An unusual and rare specimen of the iron-bearing variety of magnesite (formerly called breunnerite) from Freiberg according to the labels. I'm not 100% certain that the locality is accurate as I can't find another piece of this material for reference, but Kay had a lot of unique specimens from isolated finds, so I'm not ruling it out. Hundreds of ...

© Rob Lavinsky & MineralAuctions.com

Breunnerite in talc schist

© Dmitry Tonkacheev

Magnesite, var breunnerite and a little talc (greenish).

© Heyninck A

© Dmitry Tonkacheev

Chris Auer photo and collection, ex F.Bachler coll.

© AC

Dissolved Halite cavity in an Evaporite. Now a pseudomorph of Pyrite with overlaying Quartz crystals. Youngest mineral is the yellowish Breunnerite.

Breunnerite, Kristallen op matrix (Actinoliet) . Dit is een variëteit van Ferro Magnesiet.

14.0 x 9.3 x 8.8 cm. Ferroan magnesite (variety breunnerite) is rare from this less well-known area of the Ziller Valley. It has a Mg:Fe atomic ratio ranging from 90:10 to 70:30 and was originally reported from several Austrian localites (MINDAT). Moderately lustrous, sharp, jet-black rhombs, to 2.5 cm, are richly scattered on the striking, large, ...

© Rob Lavinsky & MineralAuctions.com

Rhombohedral Breunnerite crystals in the typic talc schist matrix.

7.2 x 5.7 x 2.5 cm. An unusual and rare specimen of the iron-bearing variety of magnesite (formerly called breunnerite) from Freiberg according to the labels. I'm not 100% certain that the locality is accurate as I can't find another piece of this material for reference, but Kay had a lot of unique specimens from isolated finds, so I'm not ruling ...

© Rob Lavinsky & MineralAuctions.com

Chris Auer photo and collection, found by a collector from Bruck/Mur in 1987, purchased by me from him in 2019

© AC

14.0 x 9.3 x 8.8 cm. Ferroan magnesite (variety breunnerite) is rare from this less well-known area of the Ziller Valley. It has a Mg:Fe atomic ratio ranging from 90:10 to 70:30 and was originally reported from several Austrian localites (MINDAT). Moderately lustrous, sharp, jet-black rhombs, to 2.5 cm, are richly scattered on the striking, large, ...

© Rob Lavinsky & MineralAuctions.com

Several well-shaped breunnerite crystals in talc schist collected during the Mindat Adventure To the Urals

© Dmitry Tonkacheev

Mesitin Spar (= ferroan magnesite) from Hainzenberg; historic specimen; on public display of the Universalmuseum Joanneum Graz; pic made through glass; Chris Auer photo taken in 2022

© AC

7.2 x 5.7 x 2.5 cm. An unusual and rare specimen of the iron-bearing variety of magnesite (formerly called breunnerite) from Freiberg according to the labels. I'm not 100% certain that the locality is accurate as I can't find another piece of this material for reference, but Kay had a lot of unique specimens from isolated finds, so I'm not ruling ...

© Rob Lavinsky & MineralAuctions.com

7.2 x 5.7 x 2.5 cm. An unusual and rare specimen of the iron-bearing variety of magnesite (formerly called breunnerite) from Freiberg according to the labels. I'm not 100% certain that the locality is accurate as I can't find another piece of this material for reference, but Kay had a lot of unique specimens from isolated finds, so I'm not ruling ...

© Rob Lavinsky & MineralAuctions.com

This individual, pseudo cubic, light tan color Magnesite Var. Breunnerite crystal is typical of the crystals found at this quarry, with a small amount of Talc coating three sides of the crystal. Collected by Dmitriy Tonkacheev at the July 2019 MINDAT Adventure field collecting trip. Personal collection of Sharon Cisneros.

© Eugene & Sharon Cisneros

Magnesite variety breunnerite pseudo octahedral crystals, translucent brown, scattered in clinochlore schist. The schist appears to have been worked to reveal more of the crystal. S421-617 N754N

© 2025, JGW

Brown rhombohedral magnesite (variety breunnerite), in greenish-grey talc-actinolite schist. Peter Lof photo and collection.

© Peter Lof

Heavy sample consisting of grey Mesitine Spar crystals in massive Magnetite and Pyrite matrix. Collection & Photo: Marco Ballati.

Rhombohedral Breunnerite crystal in typical talc schist matrix. Collection & Photo: Marco Ballati.

Creamy white Mesitine Spar crystals. Mesitine Spar is an obsolete name for an Fe-bearing variety of magnesite with the Mg:Fe atomic ratio ranging from 70:30 to 50:50. Acquired from Remco Vinken (FinkMinerals) on Catawiki on 24 February 2025.

Cluster of yellow Mesitine spar crystals.

© Itsuki Imaeda