Is this album rare since it's self-released?

Yes, being self-released by Heterodoxia in 2019, it is likely a niche and potentially rare collectible within the Jazz genre.

What format is the Heterodoxia (2) – Aproximaciones?

It is available in the CDr album format.

The album was released in 2019.

Name: Heterodoxia (2) – Aproximaciones (CDr, Album)
Brand: Heterodoxia (2)

Jazz

What Aproximaciones by Heterodoxia (2) is worth on the used market.

Label · Not On Label (Heterodoxia Self-released)Format · CDr, AlbumGenre · Jazz

Used

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New / Sealed

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Aproximaciones by Heterodoxia (2) (2019) on CDr, Album. The Discogs marketplace floor is null with 0 copies currently for sale.

Pressing, country, and condition (media + sleeve) move vinyl/CD values the most — first pressings and clean copies command a premium.

Is this album rare since it's self-released?: Yes, being self-released by Heterodoxia in 2019, it is likely a niche and potentially rare collectible within the Jazz genre.
What format is the Heterodoxia (2) – Aproximaciones?: It is available in the CDr album format.
When was this Jazz album originally released?: The album was released in 2019.