唯一無二！ マダガスカル産リディコアタイト・トルマリン • 1.85カラット • 卓越した希少な三角形の核 - Height: 10 mm - Width: 8 mm- 0.37 g - (1)

DESCRIPTION:
Like a triangular blue heart enclosed within rings of light, this liddicoatite tourmaline displays a distinctly defined triangular core framed by successive bands of pale colour, luminous yellow green and deeper green. The central triangle is the specimen’s signature feature: its converging sides and broad base create a striking geometric focal point, echoed by the layered colour boundaries surrounding it.

The blue core occupies much of the section, giving the composition depth and visual strength. Its colour ranges in the photographs from concentrated navy and deep petrol blue to brighter blue with subtle teal nuances under transmitted illumination. The contrast between this substantial central zone and its lighter surroundings makes the triangular geometry particularly expressive.

The outer rim reveals a more intricate arrangement than a simple division between blue and green. Immediately around the core, a delicate transition passes through pale blue green and mint tones, appearing almost colourless in some strongly illuminated areas. Beyond this lies a narrower band of pale yellow to luminous lemon green, tracing the central triangle like a fine border of light.

Further outward, broader green areas introduce lime, apple green and olive nuances before deepening towards a darker forest green perimeter. The outermost edges appear especially dark in selected orientations, giving the brighter inner bands a strong visual frame. These layers vary in width and intensity around the specimen, creating a sequence of nested contours with both sharply defined boundaries and softer transitions.

The relationship between the internal triangle and the external outline adds another dimension to the piece. Its pointed upper profile, sloping sides and broader lower contour form an irregular shield shape that echoes the core. Small projections, stepped edges and local indentations give the perimeter an individual character while preserving the overall coherence of the colour pattern.

Viewed obliquely, the section reveals its thickness, reflective edge surfaces and areas of parallel surface markings. The broad faces provide an expansive view into the colour zoning, while the side views show how the darker outer material frames the interior. Bright vitreous reflections move across these surfaces as the viewing angle changes.

Fine inclusions, small dark features and a network of internal fissures are visible through the illuminated zones. Some follow curved or branching paths, while others cross the colour boundaries at an angle. These details remain part of the specimen’s visible character and provide additional points of interest when examined closely.

From Madagascar, this liddicoatite tourmaline brings together a compelling combination of triangular geometry, a blue centre and a richly layered green perimeter. Its strongest visual appeal lies in the way transmitted light separates the individual colour zones, revealing the intricate framing around its unmistakable triangular heart.

SPECIFICATIONS:
• Weight: 0.37 g
• Weight in carats: 1.85 ct
• Dimensions: 10 × 8 × 2 mm
• Origin: Anjanabonoina mine, Betafo, Madagascar
• Mineral group: Tourmaline
• Identification: Liddicoatite
• Colour type: Multicolour zoning with a blue core and layered pale, yellow green and deeper green peripheral zones
• Form: Thin crystal section with an irregular triangular to shield shaped outline
• Core shape: Distinctly defined triangular colour zone
• Primary colour: Deep blue to petrol blue, appearing brighter blue with teal nuances under transmitted illumination
• Inner transition: Pale blue green to mint, locally appearing almost colourless under strong illumination
• Intermediate border: Pale yellow to luminous lemon green
• Outer colour zones: Lime, apple green and olive green, deepening towards a darker forest green perimeter
• Colour distribution: Triangular blue centre surrounded by successive bands of varying width and intensity
• Transparency: Translucent to locally transparent, most readily appreciated under transmitted illumination
• Lustre: Vitreous
• Surface features: Reflective broad faces, fine surface markings, stepped edge areas and an irregular perimeter
• Internal features: Fine inclusions, small dark features and visible linear, branching and curved fissures
• Photographic presentation: Most photographs use backlighting to reveal the colour zoning and transmission of light through the section

NOTABLE POINTS:
• Distinct Triangular Blue Heart
The clearly defined triangular centre gives the specimen its strongest visual identity. Its converging sides create a striking geometric composition within the surrounding colour bands.

• Layered Peripheral Colours
The rim contains successive pale, yellow green and deeper green zones, offering a more detailed arrangement than a single contrasting border.

• Luminous Inner Band
A narrow pale yellow to lemon green band follows the central colour pattern and becomes especially expressive under transmitted illumination.

• Delicate Transitional Halo
Pale blue green and mint areas soften parts of the boundary between the blue core and the brighter surrounding band.

• Deep Green Outer Frame
The darker green perimeter provides visual depth and strengthens the contrast with the luminous interior layers.

• Echoing Geometric Boundaries
Several colour boundaries repeat the direction of the triangular core, creating the impression of nested frames within the section.

• Contrasting Blue Expressions
The centre appears concentrated and dark in some lighting conditions, while stronger transmitted illumination reveals brighter blue and subtle teal tones.

• Individual Outer Contour
The pointed upper profile, broader base and small peripheral projections give the specimen a recognisable silhouette.

• Visible Internal Landscape
Fine inclusions and intersecting fissure patterns provide detail within both the blue centre and the surrounding lighter zones.

• Reflective Faces and Textured Edges
Vitreous surface reflections contrast with the stepped and marked areas visible along the perimeter and in oblique views.

• Display Potential with Transmitted Light
Illumination from behind makes the relationship between the central triangle and its multiple surrounding bands particularly easy to appreciate.

• Madagascar Provenance
The specimen is offered with an origin of Madagascar, as confirmed by the supplier.

COLLECTOR’S INTEREST:
The principal attraction of this liddicoatite specimen is its distinctly triangular blue core and the succession of colour bands that frame it. For a collector interested in geometric zoning, the appeal lies in being able to follow the central triangle outward through pale transitional areas, a luminous yellow green border and progressively deeper green peripheral zones.

This relationship between geometry and colour gives the section a strong identity. The blue centre draws the eye first, while closer examination reveals variations in the width, continuity and intensity of the surrounding bands. Its irregular external outline adds individuality to the more ordered internal pattern.

Most of the photographs were taken with backlighting to reveal the specimen’s colours and internal zoning, using the same principle of transmitted illumination that can be used in museum and showroom displays of translucent minerals. Under ordinary reflected light, the blue centre and green perimeter can appear considerably darker and more subdued; the photographs show how illumination changes their visual expression.

The section also rewards examination from different angles. Frontal views emphasise its triangular colour architecture, while oblique views reveal the thickness, edge texture and reflective surfaces. Internal inclusions and fissures provide further individual detail without obscuring the main arrangement of colours.

For collectors of liddicoatite tourmaline from Madagascar, blue centred sections and strongly defined geometric zoning, this specimen offers an engaging combination of colour contrast, layered structure and display interest. Preserving the complete section allows these features to be appreciated together.

LAPIDARY POTENTIAL:
The triangular blue core and its surrounding colour bands offer an attractive starting point for a design centred on preserving the complete pattern. Any approach to polishing or shaping would benefit from retaining enough of the perimeter to maintain the relationship between the blue triangle, its luminous inner border and the deeper green outer frame.

The thin section and visible internal fissures make a professional assessment important before further work or setting. A lapidary would need to evaluate structural integrity, possible material loss and the suitability of any proposed finish or mounting.

If suitable for jewellery, a protective setting with an open back could allow light to pass through the colour zones while keeping the distinctive outline visible. Retaining the specimen as a collector’s section is also an appealing option, preserving the full arrangement of its triangular heart and layered outer rim.

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Photography and transparency:
All photos were taken under controlled light conditions, carefully selected to reproduce the most accurate natural color of each specimen. No filters, color enhancement, or artificial saturation were applied. The lighting setup is used exclusively to represent the piece as it appears under neutral daylight, ensuring that buyers can appreciate its true tones and luster without distortion.

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