inXitu was a company based in Mountain View, California, which developed portable X-ray diffraction (XRD) and X-ray fluorescence (XRF) analysis instruments.

The company name was a combination of the terms in situ and X-ray, portraying the company's dedication to developing X-ray instruments that could be easily transported to the original site of the material being analyzed.

The basis for inXitu began in 2003 when Philippe Sarrazin worked with NASA to file a patent on techniques used to develop the CheMin instrument for the Mars Curiosity rover.

[1] inXitu Research merged with Microwave Power Technology (MPT) in 2007 and incorporated as inXitu, Inc.[2] MPT's research and development in high vacuum systems was meshed with inXitu's experience with XRD equipment, and in early 2008 the company released Terra, a commercial field-portable XRD/XRF instrument.

[2] Bradley Boyer joined the company as President and Chief Executive Officer in September 2008.