The phrase "a rare practice" is correct and usable in written English.
You can use it to describe an activity or behavior that is not commonly observed or performed.
Example: "In today's digital age, handwritten letters have become a rare practice among friends and family."
Alternatives: "an uncommon occurrence" or "a seldom-seen habit".
At the time it was presented as a rare practice.
Using exclamation marks in headlines is a rare practice circa 2015.
It is a rare practice to work near the limit given by Shannon's theorem.
Though sighted people are fascinated by echolocation, he said, it's still a rare practice in the blind community.
When his mother was pregnant, she listened to countless hours of Western classical music -- a rare practice in China -- hoping to transmit the rhythms to the fetus.
But corporate history-keeping was a rare practice in those days, and over time memories of Green and his sons faded.
A rare practicing economist who still describes himself as an unabashed Keynesian is Wynne Godley, a seventy-five-year-old former Cambridge University professor, who is now a distinguished scholar at the Jerome Levy Economics Institute of Bard College.
Liberal Democrat Julian Huppert, a rare practicing scientist to stand for election, might be able to fill Harris's shoes as Huppert won the Cambridge vote.
The mechanism for lifting the mortgage market was a cut of half a percentage point, to 5.75percentt, on borrowing from the discount window, a normally rare practice in which the Fed lends directly to banks facing some sort of trouble.
Mr. Barta makes his own reeds, a relatively rare practice among clarinetists (although normal for our double-reed brethren on oboe and bassoon).
RR used in FL settings is a more rare practice; studies show RR increases FL learners' reading fluency but not necessarily their comprehension, possibly due to poor comprehension test instrumentation.
