Kiwi Jasper (also known as Sesame Jasper)
Rock composed of Quartz, Feldspar, and Tourmaline (not a true Jasper) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Triclinic; usually found as a massive, microcrystalline aggregate
Mineral Group
Silicates (primarily Tectosilicates and Cyclosilicates)
Chemical Formula
SiO2 (Quartz) + KAlSi3O8 (Feldspar) + Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH,F)4 (Tourmaline)
Formation Process
Metamorphic or Igneous; formed as a mixture of minerals cooling in a shared environment
About This Crystal
A pale sea-foam green or off-white background peppered with black spots and translucent crystalline patches. It is opaque with a vitreous to waxy luster when polished.
Physical Characteristics
Pale green/white body color with black spots; white streak; no cleavage; conchoidal fracture of the quartz matrix; specific gravity approx. 2.6-2.7.
Optical Properties
Singly and doubly refractive components; aggregate refractive index approx. 1.54-1.55; no pleochroism due to opaque nature; no specific phenomena.
Hardness & Durability
Origin Region
Primarily sourced from New Zealand; found in varied igneous environments
Hardness & Durability
Mohs hardness 6 to 7; high toughness; stable and suitable for most jewelry applications; resistant to fading.
Care & Maintenance
Clean with warm soapy water; avoid harsh chemicals and ultrasonic cleaners if cracks are present; store separately to prevent scratching.
Rarity & Value
Common; relatively inexpensive; primarily valued for its unique spotty pattern; rarely treated but occasionally dyed to enhance the green color.
Special Characteristics
Characteristic black 'sesame' spots (typically Schorl Tourmaline) set against a pale, minty green or creamy matrix.
Lore & History
Commonly referred to as a 'nurturing stone' in modern folklore; believed to support those in high-stress jobs and aid in relaxation; its history is primarily modern as a decorative material.