Description
**Warning: Contains Asbestos which can cause serious th issues if not handled correctly. DO NOT Hammer, or break this rock up.
Green Tremolite – Natural Amphibole Crystal from Merelani Hills, Tanzania
This genuine Green Tremolite specimen from the Merelani Hills of Tanzania is a naturally occurring amphibole mineral carefully selected for colour, crystal structure, and collector appeal. Each piece measures approximately 10–30mm, making it ideal for mineral collections, educational displays, or compact cabinet arrangements. The photograph shows an example of the actual specimen you will receive. Please refer to the listing images for full sizing and natural variation within this range.
Your Tremolite crystal includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a 100% genuine natural mineral specimen.
Mineral Species & Chemical Composition
Tremolite is a member of the amphibole group, a complex family of inosilicate minerals. Its ideal chemical formula is:
Ca₂Mg₅Si₈O₂₂(OH)₂
Tremolite crystallises in the monoclinic crystal system and forms part of the tremolite–actinolite series, with iron substitution influencing colour variation. The green coloration in this variety typically results from minor iron content within the crystal lattice.
Key mineralogical properties include:
- Mineral Group: Amphibole (Inosilicate)
- Crystal System: Monoclinic
- Hardness: 5–6 on the Mohs scale
- Lustre: Vitreous to silky
- Transparency: Translucent to opaque
- Cleavage: Two directions at approximately 56° and 124°
The prismatic cleavage angles are characteristic of amphibole minerals and distinguish them from pyroxenes.
Geological Formation – Merelani Hills, Tanzania
The Merelani Hills are globally recognised for producing tanzanite and associated minerals. Tremolite forms in metamorphic environments, particularly in calcium-rich rocks such as marbles and dolomitic limestones subjected to regional metamorphism.
Under elevated temperature and pressure conditions, chemical reactions between calcite, dolomite, silica, and magnesium-rich fluids allow tremolite to crystallise. In the Merelani deposit, tremolite may occur alongside:
- Tanzanite (zoisite variety)
- Graphite
- Calcite
- Diopside
- Garnet
These geological conditions create well-formed prismatic crystals and fibrous aggregates typical of amphibole minerals.
Colour, Texture & Crystal Habit
Green Tremolite from Tanzania may display:
- Soft pale green to medium green tones
- Slender prismatic crystal forms
- Bladed or fibrous aggregates
- Subtle internal zoning
- Natural matrix attachments
In the 10–30mm size range, crystals may be single prismatic forms or small clusters. Natural inclusions and minor surface irregularities are part of authentic geological formation. No artificial colouring or enhancements have been applied.
Collecting & Display Appeal
Tremolite from Merelani Hills holds particular interest due to its association with one of the world’s most famous gemstone localities. Its amphibole structure and geological setting make it appealing to collectors who appreciate mineral paragenesis and metamorphic mineral formation.
This specimen size is suitable for:
- Mineral cabinet collections
- Educational geology study
- Amphibole group reference specimens
- Collector gift pieces
- Display alongside Merelani-associated minerals
In some traditions, Tremolite is spiritually associated with clarity and transformation; such associations are belief-based rather than scientific.
Authenticity & Individual Selection
Each Green Tremolite specimen is carefully chosen for natural character and crystal integrity. The listing photograph shows an example of the actual specimen you will receive within the stated 10–30mm size range. Please review all images for scale and natural variation.
Every piece is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming its genuine natural origin from the Merelani Hills, Tanzania, Africa.
A classic example of amphibole formation in metamorphosed calcium-rich environments, this Tanzanian Green Tremolite specimen offers geological significance, distinctive crystal habit, and strong collector appeal in a compact display size.
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