Observation

All IDL observers are experienced in identifying heavy minerals. IDL provides a high quality mineral observation service at affordible rates. We specialise in identifying all diamond indicator minerals. To learn more about our services for non-diamond indicators please contact IDL.

Analysis

IDL's standard procedure is to have all observed samples checked by a mineralogist.
 
Analytical services include:

1. Microscopic assessment of kimberlitic affinity and grain wear. Comparison of electron microbrobe data and morphology of kimberlite indicators to assess diamond affinity.

2. Advice for further work.

3. Identification of other types of economic mineralization.

Chrome Spinel Analysis for Kimberlite Affinity

Chrome spinel is an excellent pathfinder mineral for diamond exploration. The low hardness of chromite also gives a good measure of distance from source in an alluvial system. Unfortunately, it is also a common mineral in many types of rock.

Routine probe analysis of chrome spinel without prior morphology assessment destroys more than 50% of the data available. If the explorer is faced with background chromite the eye is far cheaper, faster and more discriminatory than the electron microprobe. Chromite derived from kimberlite has a distinctive appearance which can only be recognized through experience. Chromite studies are a combination of chemistry and appearance, each of equal weight.

Reliance on chemistry to determine diamond affinity may also be unreliable as high chrome (>60%Cr2O3) grains are susceptible to breakage. The best chromite are the ones you do not see if your indicator minerals have been subjected to abrasion or impact.

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