Lattice Quartz with Foitite from Erongo Mountains, Namibia

This Lattice Quartz with Foitite is an attractive specimen from the Erongo Mountains of Namibia, featuring broad, softly translucent quartz crystals arranged in the distinctive interlocking growth pattern characteristic of Erongo Lattice Quartz. The pale quartz forms a substantial outer framework around a central area of smaller crystals and darker Foitite-rich mineralisation, creating an intriguing contrast and giving the specimen considerable depth.

Specimen Details

• Mineral: Lattice Quartz with Foitite
• Quartz Chemical Formula: SiO₂
• Foitite: Tourmaline-group mineral
• Locality: Erongo Mountains, Erongo Region, Namibia
• Geological Setting: Erongo Sub-Volcanic Granite-Miarolitic-Pegmatite Complex
• Geological Age: Early Cretaceous, approximately 132 million years
• Quartz Colour: White to milky translucent
• Foitite Colour: Dark grey to brown
• Transparency: Translucent to locally transparent
• Crystal Habit: Interlocking lattice-like quartz crystals with smaller associated crystals
• Associated Minerals: Foitite and feldspar
• Weight: 126 g
• Size: 66 × 63 × 45 mm
• Preparation: Professionally cleaned
• Base: Natural flat base
• Display: Ready for display

The Erongo Mountains of Namibia are renowned for producing an extraordinary range of collector minerals, particularly from their granite-associated pegmatites and miarolitic cavities. The region is well known for unusual quartz formations, colourful tourmalines and a variety of rare and distinctive mineral associations.

Among the most recognisable Erongo quartz varieties is Lattice Quartz, often referred to as Gitter Quartz. Rather than growing as isolated points, the quartz crystals can develop in an unusual interlocking arrangement, producing a complex framework in which individual crystals intersect and overlap. This distinctive growth habit gives Erongo Lattice Quartz an appearance that can change dramatically depending on the viewing angle.

This specimen provides an excellent example of that unusual growth style. Several broad, pale quartz crystals form the outer structure, while smaller crystals occupy the central spaces and create a fascinating transition between the larger crystal forms. The quartz has a soft, milky appearance, with areas of greater translucency that allow glimpses into the interior of the specimen.

A particularly interesting feature is the central concentration of darker Foitite-rich mineralisation. The dark material occurs between and beneath the pale quartz crystals, creating a natural focal point and providing contrast to the predominantly white specimen. Small, clearer quartz crystals can also be seen growing amongst the darker mineralisation, adding another layer of detail when viewed closely.

The specimen has an almost flower-like or architectural arrangement, with several broad quartz crystals extending outward from the centre. Unlike a simple quartz cluster, its appeal comes from the relationship between the individual crystals and the spaces created between them. The different viewing angles reveal changing combinations of broad crystal faces, smaller points and the darker mineral-rich interior.

At 126 grams and measuring 66 × 63 × 45 mm, this is a compact but substantial collector specimen. It has been professionally cleaned while retaining its natural flat base, allowing it to stand securely for display without requiring a separate stand.

Quartz has a Mohs hardness of approximately 7, but the projecting crystal edges and intricate intergrowths can be susceptible to damage from impact. Handle carefully and avoid unnecessary abrasion or movement once the specimen has been positioned.

A beautiful example of Erongo's distinctive Lattice Quartz, this specimen combines softly translucent quartz, an unusual interlocking crystal structure and contrasting Foitite-rich mineralisation. Its natural flat base makes it an especially appealing addition to a mineral display or Namibian mineral collection.