In Sep, last year, Google started indexing SVG files, but the results were only returned by the web search engine.
Now you can find SVG files in Google Image Search by restricting the results to this filetype in the advanced search page or by using the filetype operator. Here's an example: [molecule filetype:svg]. If you restrict the results to Wikipedia, Google returns 57,300 SVG files.
"SVG is an open, XML-based format for vector graphics with support for interactive elements. We're big fans of open standards, and our mission is to organize the world's information, so indexing SVG is a natural step. We index SVG content whether it is in a standalone file or embedded directly in HTML," explained Google at that time.
Here're the images of above cited example: