The phrase "although unusually" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding something that is not typical or expected.
Example: "Although unusually warm for this time of year, the weather has been pleasant."
Alternatives: "even though it's atypical" or "despite being uncommon."
She called herself a spinster and, although unusually social, always seems to have lived alone.
They lost appeals all the way to the Supreme Court, although – unusually – they were not ordered to pay their costs.
Livingstone's parents were "working class Tories", although unusually held tolerant views, opposing racism and homophobia.
Although oden, unusually for Japan, involves no rice, the soup depends on the same key ingredient as rice — a quality water source.
Spending on less expensive items has already slowed, although the unusually warm weather last month could have temporarily depressed interest in things like sweaters, coats and scarves.
His sisters shared a second bedroom, and the third, almost incredibly — although not unusually for Hong Kong — was occupied by a tenant, a woman in her 20s, whom Mr. Chang remembers only for the space she took up.
Although an unusually large team of 15 epidemiologists and laboratory scientists was sent out when the initial anthrax case was reported in Florida on Oct. 4, the investigation started in the traditional mode, with the assumption that the disease had natural causes, Dr. Hughes said.
Although an unusually high percentage of her films survive -- "Of her 51 features, 32 are currently thought to be complete and 10 more are preserved in part," Greta de Groat writes on her excellent Talmadge Web site (stanford.edu/gdegroat/NT/home.htm) -- until now only a handful of her earlier movies have been available on home video.
Although in unusually and noted bad humour after this incident, Nansouty subsequently led a most brilliant action at Craonne.
Although an unusually large drift event in the hemagglutinin of A/H1N1 viruses was reported in 1947 (29 ), subsequent changes in this protein remained minor until after 1951 (27 ).
Although an unusually high variability in performance is one of the strongest findings yet to emerge from cognitive-experimental research on ADHD [ 4, 5, 7], this needs not pose a problem for test-retest reliability: if variability in performance indicates a true underlying process, we can aim to obtain reliable indicators of this characteristic.
