diff --git a/var/spack/repos/builtin/packages/py-trx-python/package.py b/var/spack/repos/builtin/packages/py-trx-python/package.py
new file mode 100644
index 00000000000..9f7c09fcb6c
--- /dev/null
+++ b/var/spack/repos/builtin/packages/py-trx-python/package.py
@@ -0,0 +1,28 @@
+# Copyright 2013-2024 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class PyTrxPython(PythonPackage):
+    """Experiments with new file format for tractography."""
+
+    homepage = "https://tee-ar-ex.github.io/trx-python/"
+    pypi = "trx-python/trx-python-0.2.9.tar.gz"
+
+    maintainers("ChristopherChristofi")
+
+    license("BSD-2-Clause")
+
+    version("0.2.9", sha256="16b4104d7c991879c601f60e8d587decac50ce60388aae8d0c754a92136d1caf")
+
+    depends_on("py-setuptools@42.0:", type="build")
+    depends_on("py-setuptools-scm@3.4:+toml", type=("build", "run"))
+    depends_on("py-setuptools-scm-git-archive", type="build")
+    depends_on("py-packaging@19.0:", type="build")
+    depends_on("py-cython@0.29:", type="build")
+    depends_on("py-deepdiff", type=("build", "run"))
+    depends_on("py-nibabel@5:", type=("build", "run"))
+    depends_on("py-numpy@1.22:", type=("build", "run"))