Diolite

Diolite
Sire	Diophon
Grandsire	Grand Parade
Dam	Needle Rock
Damsire	Rock Sand
Sex	Stallion
Foaled	1927[1]
Died	1951 (aged 23–24)
Country	United Kingdom
Colour	Bay
Breeder	C W Birkin
Owner	Hugo Hirst
Trainer	Fred Templeman
Record	13: 5-2-3 (incomplete)
Earnings	£17,066[2]
Major wins
Coventry Stakes (1929) Molecomb Stakes (1929) 2000 Guineas (1930)
Awards
Top-rated British two-year-old (1929)

Diolite (1927 – 1951) was a British Thoroughbred racehorse and sire. He was arguably the best British two-year-old of 1929, when he won three of his five races including the Coventry Stakes and the Molecomb Stakes. In the following year he won the 2000 Guineas and finished third when favourite for the Epsom Derby. He remained in training for another two years but won only one more race. After his retirement from racing he became a very successful breeding stallion in Japan.