Hi!
With the small number of properties, it should also be easy to get much of their data with a SPARQL query (depending on what you need). Does BlazeGraph support CONSTRUCT?
Yes. For example, this one: http://preview.tinyurl.com/hk5sudz
should produce a list of property definitions for WikibaseItem type. These are already part of the dump, but they work as an illustration.
Right now there's no way to get data into TTL RDF serialization (maybe in the future) but XML one works: https://www.mediawiki.org/wiki/Wikidata_query_service/User_Manual#Supported_...