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Iris Quartz

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PDM859071

Iris Quartz

Classic Locality

Description Tabs

Description
Locality: 
Madhya Pradesh, India
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.1 × 6.5 × 2.6 cm
Weight: 
137.00gr
Description

Aggregate of translucent quartz with attractive multicoloured reflexes, mainly in green and yellow in this specimen at the rhombohedral faces, producing the so called iris quartz. Good representative specimen for the locality. According to (Petrov and Tanaka, 2011), iris quartz (or rainbow quartz) is a quartz variety displaying internal spectral single colours or tiny rainbows normally on the rhombohedral faces.

These internal colours are interference phenomenon due to reflection and refraction on extremely thin parallel Brazil-law twinning lamellae (See Mindat: Iris quartz, by Alfredo Petrov and Yuko Tanaka, 2011).

Ex Jan Sibtsen specimen #4562.

Mineral Data
What's on the rock

Iris Quartz

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Hardness: 
0.0

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