MARTITE & LIZARDITE – Black Crystals in Bright Yellow Matrix, Snarum, Norway

This is a beautiful, fully natural specimen of Martite — hematite that has chemically replaced an original magnetite crystal while faithfully preserving its outward crystal form — sharply embedded in a matrix of bright yellow-green Lizardite. The crystal faces are well developed, allowing the geometry of the original octahedral magnetite form to be clearly appreciated, with a lustrous, dark metallic surface that contrasts vividly against the glossy, waxy yellow serpentine matrix surrounding it.

The specimen comes from the Øvre Dypingdal Mine, part of the Dypingdal serpentine-magnesite deposit near Snarum, in the Modum district of Buskerud, Norway. This large open-pit mine, active since at least the early 20th century, is now abandoned, which makes fresh, well-formed material from this classic Norwegian locality increasingly difficult to find on today's market. The deposit is specifically renowned among mineral collectors for producing exactly this kind of association: sharp, well-formed iron oxide crystals set directly into a serpentine host rock.

The piece combines strong aesthetic appeal with genuine mineralogical interest, making it a fitting addition to a systematic or locality-focused collection, as well as an eye-catching display piece thanks to the harmonious growth of the crystals and the richness of its color contrast.

This specimen combines two very different minerals in a single piece. The black, metallic crystals are Martite, the name given to hematite (Fe2O3) when it occurs as a pseudomorph after magnetite (Fe3O4): under conditions of increasing oxygen availability, iron in the original magnetite crystal is chemically reorganized into the hematite structure, while the outward shape of the crystal — typically octahedral, inherited from magnetite's cubic symmetry — is preserved. The dark, almost black color and strong metallic luster of these crystals are due to the dense concentration of Fe3+ iron in the hematite crystal lattice.

The bright yellow-green matrix is Lizardite, a hydrous magnesium silicate of the serpentine group, formed through the low-temperature alteration of magnesium-rich minerals such as olivine and pyroxene in ultramafic rocks — a process entirely consistent with the serpentine-magnesite geology of the Dypingdal deposit. Its yellow-green color is caused by trace iron and nickel substituting within its sheet-silicate structure, along with fine-grained textural effects typical of massive serpentine minerals.

The Øvre Dypingdal Mine, an open-pit operation in the Modum district of Buskerud, Norway, is now abandoned, and is specifically known among collectors for producing well-formed iron oxide crystals of this kind embedded directly in serpentine matrix.

• Formula: Fe2O3 (Martite, after Magnetite Fe3O4) / Mg3Si2O5(OH)4 (Lizardite)
• Key chemical elements: Iron, Oxygen, Magnesium, Silicon, Hydrogen
• Hardness (Mohs scale): 5.5–6.5 (Martite) / 2.5–3 (Lizardite)
• Mineral class: Oxides (Martite/Hematite group) and Silicates (Lizardite, Serpentine group, Phyllosilicates)
• Crystal system: Trigonal (Martite, after cubic Magnetite) / Monoclinic (Lizardite)
• Crystal habit: Octahedral pseudomorphic crystals on a massive, waxy matrix
• Formation: Oxidative replacement of magnetite by hematite (Martite), within a serpentine-magnesite deposit formed by alteration of ultramafic rock (Lizardite)
• Color: Black, metallic (Martite) / Bright yellow-green (Lizardite)
• Locality status: Abandoned open-pit mine

Lizardite is a serpentine-group mineral often nicknamed "Norwegian jade" in the collecting community because of its smooth, waxy texture and vivid yellow-green tones, which can resemble true jade at a glance despite the two having entirely different compositions.

Martite is not a distinct mineral species but a pseudomorph: it forms when hematite chemically replaces magnetite while preserving the original crystal's external shape, most often the octahedral form typical of magnetite, so a Martite crystal effectively lets you see the outline of a magnetite crystal even though the material inside is now hematite.

The Øvre Dypingdal Mine was worked as a large open-pit operation, documented in photographs dating back to around 1914, and is specifically noted among mineralogists for its well-formed iron oxide crystals embedded in serpentine and hydrotalcite. The mine is no longer active today, adding to the appeal of well-crystallized specimens like this one for collectors seeking material from a classic, no-longer-productive Norwegian locality.

Martite, the black crystalline form of hematite after magnetite, is traditionally associated with grounding and inner strength. Like other iron oxide minerals, it is believed to help anchor scattered energy, support physical vitality and encourage focus, confidence and a steady, calm presence in daily life.

The metallic black faces of this specimen stand out against a bright yellow-green matrix of Lizardite serpentine from Snarum, Norway, said to bring a gentle, renewing quality to its grounding energy. Lizardite is traditionally linked to emotional balance, inner transformation and a closer connection to the earth, while its warm tone is thought to support calm and openness. Together, the two minerals are linked to the Root chakra for stability and the Heart chakra for emotional balance.

These interpretations are not scientifically proven.

Chakra: Root, Heart

Photos: All photographs are taken under professional lighting conditions to accurately highlight crystal structure, color and detail. However, slight variations in tone and appearance may occur depending on screen calibration and ambient lighting conditions.

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