![]() Type IIa diamonds typically have an anhedral crystal shape and exhibit a range of elongated, distorted, or irregular morphologies. Many pink and brownish-pink diamonds are also Type IIa. Type IIa diamonds contain no nitrogen or boron impurities and are frequently either top white colours (D, E, F, or G) or shades of brown. The Koloa pipe, part of the Ekati mining complex, 34 kilometers west of the Sequoia kimberlite complex is also known to contain these types of diamonds. While Letseng is a low grade (1.5-3 cpht) kimberlite and Karowe approximately (15 cpht), they are probably the most prolific source of large high-value Type IIa diamonds, which contribute to making Letseng and Karowe highly economic deposits. Only a small number of active diamond mines regularly produce Type IIa diamonds with the most significant of these being Letseng-la-Terae (Letseng Mine) in the Kingdom of Lesotho and Karowe in Botswana. This is in contrast to the global distribution where it is estimated Type IaA dominates 96% and Type IIa diamonds only make up 2%. See Figure 1 showing a pie graph depicting the results. The results show that 50% of the diamonds are nitrogen free type IIa diamonds, 33% Type IaA, and 17% Type IaB. Diamonds are broadly divided into two types (I and II) based on the presence or absence of nitrogen impurities and further subdivided according to the arrangement of nitrogen atoms (isolated or aggregated) and the occurrence of boron impurities. This type of spectrometry is used to determine the concentration and aggregation state of nitrogen within the diamonds. ![]() The diamonds were studied at the Saskatchewan Research Council Diamond laboratory in Saskatoon, (an ISO/IEC 1705 Standard lab), using Fourier Transform Infrared ("FTIR") Spectrometry. (“ Arctic Star ” or the “ Company ”) (TSXV:ADD) (Frankfurt:82A2) (WKN:A2DFY5) (OTC:ASDZF) is pleased to announce that has received the results of a diamond type study based on twelve >0.3mm diameter diamonds retrieved by caustic fusion analysis of the Sequoia Kimberlite in 2021, on is Diagras diamond property, NT May 17th, 2022 – TheNewswire - Vancouver, British Columbia – Arctic Star Exploration Corp. This result adds to a number of lines of evidence that this kimberlite complex has the potential to carry >50ct gems, indicator mineral chemistry collaborates with this, along with the diamond size distribution and the diamond descriptions (all described as clear white).įurther drill definition is underway, this work will aid plans for a future bulk sample to recover >1500ct of commercial stones. Analysis of 12 >0.3mm diamonds, recovered in 2021 from the Sequoia kimberlite complex shows 50% are nitrogen free type IIa diamonds
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