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Strontium titanate does not have the hardness and toughness of diamond, and that was a problem. It has a hardness of 5.5 -- low enough that contact with many common objects could result in a scratch or a damaged facet edge. This deficiency allowed newly developed simulants a place in the market.
Strontium titanate is both much denser (specific gravity 4.88 for natural, 5.13 for synthetic) and much softer (Mohs hardness 5.5 for synthetic, 6–6.5 for natural) than diamond.
Fabulite strontium titanate sometimes contain small gas bubbles. Stones might show polishing marks or scratches due to low mohs hardness.
It is both softer (hardness 5.5) and more brittle than synthetic rutile—for this reason, strontium titanate was also combined with more durable materials to create composites. It was otherwise the best simulant around at the time, and at its peak annual production was 1.5 million carats (300 kg).
Hardness. On the Mohs scale of gem hardness, genuine diamonds rank right at the top, with a hardness of 10, making them extremely scratch-resistant. Strontium titanate, on the other hand, has a hardness of just 5, making it relatively soft in comparison.
Physical Properties of Strontium Titanate. Mohs Hardness. 5.5 to 6 Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Specific Gravity. 5.11 to 5.15 Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Tenacity.
One method is to test the hardness of one mineral against another. This is done through the ability of a harder material to scratch a softer one. The Mohs' Hardness Scale rates the hardness of a mineral relative to others. It was created by German mineralogist Friedrich Mohs.
Durability of Stronitum Titanate. On the Mohs scale, strontium Titanate ranks from 6-6.5. Because of its low durability, contact with a variety of ordinary items can cause a scratch or damage to the facet edge.
Strontium titanate (SrTiO3) has a perovskite structure and is probably best known for its high dielectric constant. It is used in varistors and tunable HTS microwave filters. Properties of strontium titanate are provided.
Mohs Hardness: 5 – 6 Comments: No natural counterpart; generally flawless; gas bubbles possible, polishing marks; abraded and rounded facet junctions; no see thru; high relief in methylene iodide; confused with diamond, CZ, GGG and YAG.